feat(ai): 写作模式加「写作参数」面板，可选填活动信息

选了文体（走「内容创作与宣传助手」）后，输入框上方出现可折叠的「写作参数」：
活动类型 chip（含「不限」= 不下发 event_type）、活动主题/时间/地点/参与人员四格，
字数并入同一块。自由创作（走「AI 创意助手」）时整块不出现。

- 只有实际填了参数才下发，空格子不带；活动类型默认空串，不替用户猜类型。
- 只填参数、不写正文也能发送，气泡上用一句「（按写作参数生成：…）」占位，
  避免出现空消息。
- 面板默认收起。

src/views/oa/chatgpt/index.vue

@@ -241,6 +241,99 @@
                             </button>
                         </template>
                     </div>
+                    <!--
+                        写作参数：只有选了文体（= 走「内容创作与宣传助手」）才有意义。
+                        自由创作时「AI 创意助手」只吃 user_content，这块整块隐藏。
+                        默认收起：写作模式下多数人只写一段话，参数是补充项。
+                    -->
+                    <div
+                        v-if="activeChatMode === 'writing' && writingTemplateMode"
+                        class="param-block"
+                        :class="{ 'is-open': writingParamsOpen }"
+                    >
+                        <div class="param-head">
+                            <span class="param-title">写作参数</span>
+                            <span class="param-hint">活动信息可选填，填了会一并提交</span>
+                            <span v-if="writingParamCount" class="param-count">
+                                已填 {{ writingParamCount }} 项
+                            </span>
+                            <button
+                                class="param-toggle"
+                                type="button"
+                                :disabled="loading"
+                                @click="writingParamsOpen = !writingParamsOpen"
+                            >
+                                {{ writingParamsOpen ? "收起" : "展开" }}
+                                <span class="param-caret" :class="{ 'is-open': writingParamsOpen }">⌄</span>
+                            </button>
+                        </div>
+                        <div v-if="writingParamsOpen" class="param-body">
+                            <div class="param-row">
+                                <span class="param-field-label">活动类型</span>
+                                <button
+                                    class="ratio-option"
+                                    type="button"
+                                    :class="{ 'is-active': !writingParams.eventType }"
+                                    :disabled="loading"
+                                    @click="writingParams.eventType = ''"
+                                >
+                                    不限
+                                </button>
+                                <button
+                                    v-for="item in WRITING_EVENT_TYPE_OPTIONS"
+                                    :key="item"
+                                    class="ratio-option"
+                                    type="button"
+                                    :class="{ 'is-active': writingParams.eventType === item }"
+                                    :disabled="loading"
+                                    @click="writingParams.eventType = item"
+                                >
+                                    {{ item }}
+                                </button>
+                            </div>
+                            <div class="param-grid">
+                                <label class="param-field">
+                                    <span>活动主题</span>
+                                    <input
+                                        v-model="writingParams.theme"
+                                        type="text"
+                                        :disabled="loading"
+                                        placeholder="例如：春季植树志愿服务"
+                                    />
+                                </label>
+                                <label class="param-field">
+                                    <span>活动时间</span>
+                                    <input
+                                        v-model="writingParams.time"
+                                        type="text"
+                                        :disabled="loading"
+                                        placeholder="例如：2026年4月8日下午"
+                                    />
+                                </label>
+                                <label class="param-field">
+                                    <span>活动地点</span>
+                                    <input
+                                        v-model="writingParams.location"
+                                        type="text"
+                                        :disabled="loading"
+                                        placeholder="例如：校史馆广场"
+                                    />
+                                </label>
+                                <label class="param-field">
+                                    <span>参与人员</span>
+                                    <input
+                                        v-model="writingParams.participants"
+                                        type="text"
+                                        :disabled="loading"
+                                        placeholder="例如：青年志愿者代表共120人"
+                                    />
+                                </label>
+                            </div>
+                            <div class="param-foot">
+                                下方输入框里的内容会作为「亮点内容」提交；活动主题留空时由上游自己拟标题。
+                            </div>
+                        </div>
+                    </div>
                     <div v-if="activeChatMode === 'image'" class="ratio-panel attach-panel">
                         <span class="ratio-label">参考素材</span>
                         <button
@@ -320,7 +413,7 @@
 <script lang="ts" setup>
 import "bytemd/dist/index.min.css";
 import dayjs from "dayjs";
-import { computed, nextTick, onBeforeUnmount, onMounted, ref } from "vue";
+import { computed, nextTick, onBeforeUnmount, onMounted, reactive, ref } from "vue";
 import { useRouter } from "vue-router";
 import "github-markdown-css/github-markdown-light.css";
 import gfm from "@bytemd/plugin-gfm";
@@ -338,6 +431,7 @@ import { manuscriptGen } from "@/api/ai/manuscriptGen";
 import {
     WRITING_DOC_TYPE_FREE,
     WRITING_DOC_TYPE_OPTIONS,
+    WRITING_EVENT_TYPE_OPTIONS,
     WRITING_WORD_COUNT_OPTIONS
 } from "./writing-params";
 import { creativeAssistant, uploadAiFile } from "@/api/ai/creativeAssistant";
@@ -405,6 +499,17 @@ const fileInputRef = ref<HTMLInputElement>();
 // 写作模式的显式选择：默认 auto = 不下发这两个字段的值，交给上游 Dify 识别
 const writingDocType = ref(WRITING_DOC_TYPE_FREE);
 const writingWordCount = ref("auto");
+// 「写作参数」面板：只有选了文体（走「内容创作与宣传助手」）时才出现。
+// 这些字段都是上游开始节点的可选变量，留空就不下发（后端 buildManuscriptInputs 会跳过空串）。
+const writingParamsOpen = ref(false);
+const writingParams = reactive({
+    // 空串 = 不限，不替用户猜活动类型；选了才下发 event_type
+    eventType: "",
+    theme: "",
+    time: "",
+    location: "",
+    participants: ""
+});
 const wsConnected = ref(false);
 const deletingChatId = ref<number>();
 const messages = ref<ChatMessageItem[]>([]);
@@ -433,9 +538,20 @@ const userName = computed(
  */
 const showAdminEntry = computed(() => !isOnlyStudent());
 
-const canSend = computed(
-    () => content.value.trim().length > 0 && !loading.value && !uploadingFiles.value
-);
+const canSend = computed(() => {
+    if (loading.value || uploadingFiles.value) {
+        return false;
+    }
+    if (content.value.trim().length > 0) {
+        return true;
+    }
+    // 选了文体并填了写作参数时，正文可以先空着：亮点由参数与上游提示词补
+    return (
+        activeChatMode.value === "writing" &&
+        writingTemplateMode.value &&
+        writingParamCount.value > 0
+    );
+});
 
 const isCanceledError = (error: any) =>
     error?.code === "ERR_CANCELED" ||
@@ -463,8 +579,22 @@ const writingTemplateMode = computed(
     () => writingDocType.value !== WRITING_DOC_TYPE_FREE
 );
 
+/**
+ * 写作参数里用户真正填了几项（不含活动类型：它默认「不限」，算进去会让面板
+ * 一打开就显示「已填 1 项」，反而误导）。
+ */
+const writingParamCount = computed(
+    () =>
+        [writingParams.theme, writingParams.time, writingParams.location, writingParams.participants].filter(
+            (value) => String(value || "").trim().length > 0
+        ).length
+);
+
 const inputPlaceholder = computed(() => {
     if (activeChatMode.value === "writing") {
+        if (writingTemplateMode.value) {
+            return "写清活动亮点、流程、成果等关键信息，会作为「亮点内容」提交；标题、地点等可在上方「写作参数」里补";
+        }
         return "描述你想创作的内容，例如：帮我写一段迎新晚会的主持人开场词，口语化一点（选了文体后才需要再定字数）";
     }
     if (activeChatMode.value === "image") {
@@ -1015,9 +1145,9 @@ const pickString = (...values: unknown[]) => {
 const buildWritingPayload = (query: string) => {
     // 两条路，都不解析自然语言（2026-10-21 改造）：
     // - 自由创作：原话整段作为 userContent，后端见 docType 为空就转「AI 创意助手」；
-    // - 选了文体：原话整段作为 highlights，只带界面显式选过的 docType / number，
-    //   其余可选字段留空交给上游。doc_type / Number 是上游提示词的**主控指令**，
-    //   本地猜会猜错（见 issue 13）。
+    // - 选了文体：原话整段作为 highlights，「写作参数」里填了的活动类型 / 主题 / 时间 /
+    //   地点 / 参与人员原样下发，没填的不带。doc_type / Number 是上游提示词的
+    //   **主控指令**，本地猜会猜错（见 issue 13）。
     const content = String(query || "").trim();
     if (writingDocType.value === WRITING_DOC_TYPE_FREE) {
         return { docType: "", userContent: content };
@@ -1027,12 +1157,34 @@ const buildWritingPayload = (query: string) => {
         highlights: content,
         files: []
     };
+    const optionalFields: [string, string][] = [
+        ["eventType", writingParams.eventType],
+        ["theme", writingParams.theme],
+        ["time", writingParams.time],
+        ["location", writingParams.location],
+        ["participants", writingParams.participants]
+    ];
+    optionalFields.forEach(([key, value]) => {
+        const text = String(value || "").trim();
+        if (text) {
+            payload[key] = text;
+        }
+    });
     if (writingWordCount.value !== "auto") {
         payload.number = Number(writingWordCount.value);
     }
     return payload;
 };
 
+/** 没写正文、只填了写作参数时，聊天气泡上给一句说明，不显示空消息 */
+const writingRequestSummary = () => {
+    const parts = [
+        writingDocType.value,
+        writingParams.theme || writingParams.location || writingParams.time
+    ].filter((item) => String(item || "").trim().length > 0);
+    return `（按写作参数生成：${parts.join(" · ")}）`;
+};
+
 const formatWritingResult = (payload: unknown) => {
     if (typeof payload === "string") {
         return payload;
@@ -1439,6 +1591,12 @@ const onSend = async () => {
         return;
     }
     const query = content.value.trim();
+    // 只填了写作参数、没写正文时，气泡上仍要有一句话，否则是一条空消息
+    const displayQuery =
+        query ||
+        (activeChatMode.value === "writing" && writingTemplateMode.value
+            ? writingRequestSummary()
+            : query);
     loading.value = true;
     stopping.value = false;
     currentTaskId.value = undefined;
@@ -1449,7 +1607,7 @@ const onSend = async () => {
         messages.value.push({
             id: createMessageId("user"),
             role: "user",
-            content: query
+            content: displayQuery
         });
         messages.value.push({
             id: assistantId,
@@ -2118,6 +2276,163 @@ export default {
     cursor: not-allowed;
 }
 
+/* 「写作参数」面板：只在选了文体时出现，默认收起，避免挤占写作输入区 */
+.param-block {
+    margin-bottom: 12px;
+    padding: 10px 12px;
+    border: 1px dashed rgba(21, 144, 255, 0.28);
+    border-radius: 12px;
+    background: #f9fcff;
+    transition: border-color 0.2s ease, background 0.2s ease;
+}
+
+.param-block.is-open {
+    border-style: solid;
+    background: #f5fbff;
+}
+
+.param-head {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    min-height: 24px;
+}
+
+.param-title {
+    color: #1590ff;
+    font-size: 13px;
+    font-weight: 700;
+}
+
+.param-hint {
+    color: #8aa4bd;
+    font-size: 12px;
+}
+
+.param-count {
+    padding: 1px 8px;
+    border-radius: 999px;
+    background: rgba(21, 144, 255, 0.12);
+    color: #1590ff;
+    font-size: 12px;
+    font-weight: 600;
+}
+
+.param-toggle {
+    display: inline-flex;
+    align-items: center;
+    gap: 4px;
+    margin-left: auto;
+    padding: 2px 10px;
+    border: none;
+    border-radius: 999px;
+    background: transparent;
+    color: #1590ff;
+    font-size: 12px;
+    font-weight: 600;
+    cursor: pointer;
+}
+
+.param-toggle:hover:not(:disabled) {
+    background: rgba(21, 144, 255, 0.1);
+}
+
+.param-toggle:disabled {
+    opacity: 0.6;
+    cursor: not-allowed;
+}
+
+.param-caret {
+    display: inline-block;
+    /* 收起时箭头朝下（提示「还有内容在下面」），展开后翻上来 */
+    transform: rotate(0deg);
+    transition: transform 0.2s ease;
+}
+
+.param-caret.is-open {
+    transform: rotate(180deg);
+}
+
+.param-body {
+    margin-top: 10px;
+    padding-top: 10px;
+    border-top: 1px solid rgba(21, 144, 255, 0.12);
+}
+
+.param-row {
+    display: flex;
+    align-items: center;
+    flex-wrap: wrap;
+    gap: 8px;
+    margin-bottom: 10px;
+}
+
+.param-field-label {
+    color: #5f7f9f;
+    font-size: 13px;
+    font-weight: 600;
+}
+
+.param-grid {
+    display: grid;
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+    gap: 8px 12px;
+}
+
+.param-field {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    min-width: 0;
+}
+
+.param-field span {
+    flex: 0 0 auto;
+    color: #5f7f9f;
+    font-size: 12px;
+    font-weight: 600;
+}
+
+.param-field input {
+    flex: 1 1 auto;
+    min-width: 0;
+    height: 30px;
+    padding: 0 10px;
+    border: 1px solid rgba(21, 144, 255, 0.24);
+    border-radius: 8px;
+    background: #fff;
+    color: #33475b;
+    font-size: 13px;
+    outline: none;
+}
+
+.param-field input::placeholder {
+    color: #b6c9da;
+}
+
+.param-field input:focus {
+    border-color: #1590ff;
+    box-shadow: 0 0 0 2px rgba(21, 144, 255, 0.12);
+}
+
+.param-field input:disabled {
+    background: #f4f7fa;
+    cursor: not-allowed;
+}
+
+.param-foot {
+    margin-top: 10px;
+    color: #8aa4bd;
+    font-size: 12px;
+    line-height: 1.5;
+}
+
+@media (max-width: 820px) {
+    .param-grid {
+        grid-template-columns: minmax(0, 1fr);
+    }
+}
+
 .attach-hint {
     color: #8aa4bd;
     font-size: 12px;

src/views/oa/chatgpt/writing-params.ts

@@ -42,3 +42,19 @@ export const WRITING_WORD_COUNT_OPTIONS = [
   { label: '1000字', value: '1000' },
   { label: '1500字', value: '1500' }
 ];
+
+/**
+ * 活动类型（上游 `event_type`）的候选值。
+ *
+ * 上游开始节点把 event_type 声明成普通 text-input，没有枚举约束，这里给一组常用值
+ * 只是为了让用户不用手打；与两个「写作表单页」的取值保持一致
+ * （tuanwei-uniapp/src/pages/manuscript 与 tuanwei-admin/src/views/gxmu/manuscriptGen）。
+ */
+export const WRITING_EVENT_TYPE_OPTIONS = [
+  '校园活动',
+  '志愿服务',
+  '会议论坛',
+  '社会实践',
+  '文体活动',
+  '品牌项目'
+];