fix(contacts): 修复资料面板读取错误数据源

- 新增单联系人资料接口 /api/chat/contacts/profile

- realtime 优先读取 wcdb_get_contact，失败后查询 contact/stranger 表

- 前端资料卡改为按 username 拉取单联系人资料，不再拉全量联系人列表匹配

- 解析 extra_buffer 的 blob/hex/base64 形态，返回昵称、微信号、地区、签名和来源

- 补充群成员和非联系人列表资料读取回归测试

Author: 2977094657

frontend/composables/chat/useChatMessages.js

@@ -1032,15 +1032,12 @@ export const useChatMessages = ({
     contactProfileLoading.value = true
     contactProfileError.value = ''
     try {
-      const response = await api.listChatContacts({
+      const response = await api.getChatContactProfile({
         account,
         source: DEFAULT_CHAT_SOURCE,
-        include_friends: true,
-        include_groups: true,
-        include_officials: true
+        username
       })
-      const list = Array.isArray(response?.contacts) ? response.contacts : []
-      const matched = list.find((item) => String(item?.username || '').trim() === username)
+      const matched = response?.contact && typeof response.contact === 'object' ? response.contact : null
       if (matched) {
         const normalized = { ...matched, username }
         if (!String(normalized.displayName || '').trim() && displayNameFallback) {

frontend/composables/useApi.js

@@ -514,6 +514,15 @@ export const useApi = () => {
     return await request(url)
   }
 
+  const getChatContactProfile = async (params = {}) => {
+    const query = new URLSearchParams()
+    if (params && params.account) query.set('account', params.account)
+    if (params && params.source) query.set('source', params.source)
+    if (params && params.username) query.set('username', params.username)
+    const url = '/chat/contacts/profile' + (query.toString() ? `?${query.toString()}` : '')
+    return await request(url)
+  }
+
   const exportChatContacts = async (payload = {}) => {
     return await request('/chat/contacts/export', {
       method: 'POST',
@@ -728,6 +737,7 @@ export const useApi = () => {
     getSnsExport,
     cancelSnsExport,
     listChatContacts,
+    getChatContactProfile,
     exportChatContacts,
     createAccountArchiveExport,
     getAccountArchiveExport,