feat: 首页发布增加发布类型选择（公开/私有/私信）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

miniprogram/pages/home/index.js

@@ -7,13 +7,23 @@ const QUICK_TEXTS = [
   '高薪兼职日结，扫码进群立刻赚钱。'
 ]
 
+const VISIBILITY_OPTIONS = [
+  { value: 'public', label: '公开信息发布' },
+  { value: 'private', label: '私有信息发布' },
+  { value: 'direct', label: '用户私信发布' }
+]
+
 Page({
   data: {
     loading: false,
     user: null,
     text: '',
     result: null,
-    quickTexts: QUICK_TEXTS
+    quickTexts: QUICK_TEXTS,
+    visibilityOptions: VISIBILITY_OPTIONS,
+    visibilityIndex: 0,
+    visibility: 'public',
+    recipientUsername: ''
   },
 
   onShow() {
@@ -43,13 +53,20 @@ Page({
   },
 
   onInput(e) {
-    this.setData({ text: e.detail.value || '' })
+    const field = e.currentTarget.dataset.field || 'text'
+    this.setData({ [field]: e.detail.value || '' })
   },
 
   fillQuick(e) {
     this.setData({ text: e.currentTarget.dataset.text || '' })
   },
 
+  onVisibilityChange(e) {
+    const idx = Number(e.detail.value)
+    const row = this.data.visibilityOptions[idx] || this.data.visibilityOptions[0]
+    this.setData({ visibilityIndex: idx, visibility: row.value })
+  },
+
   async publish() {
     if (this.data.loading) return
     const text = (this.data.text || '').trim()
@@ -58,12 +75,26 @@ Page({
       return
     }
 
+    const payload = {
+      text,
+      visibility: this.data.visibility
+    }
+
+    if (this.data.visibility === 'direct') {
+      const receiver = (this.data.recipientUsername || '').trim()
+      if (!receiver) {
+        wx.showToast({ title: '私信请填写接收人用户名', icon: 'none' })
+        return
+      }
+      payload.recipient_username = receiver
+    }
+
     this.setData({ loading: true })
     try {
       const result = await request({
         url: '/content/publish',
         method: 'POST',
-        data: { text }
+        data: payload
       })
 
       this.setData({