feat(ui): Add user cache and batch fetch in VBase

- Add shared users cache object to VBase constructor
    - Add User(id) API for reactive user info lookup
    - Implement _flushUserRequests for batch POST /api/auth/users
    - Cache and sync current user into shared users cache
    - Clear users cache on logout

ui/env.js

@@ -11,7 +11,8 @@ export default async ($mod) => {
   }
 
   // Initialize VBase Service
-  const vbase = new VBase('vb', $mod.scoped); // Relative path
+  $mod.users = {}
+  const vbase = new VBase('vb', $mod.scoped, null, $mod.users); // Relative path
   $mod.$vbase = vbase;
 
   // Wrap Axios: add auth header

ui/vbase.js

@@ -14,7 +14,7 @@ export const Level = {
 };
 
 class VBase {
-  constructor(scope, baseURL, login_page) {
+  constructor(scope, baseURL, login_page, users = {}) {
     if (!scope) throw new Error('VBase: scope is required');
     if (!baseURL) baseURL = window.location.origin;
     if (baseURL === '' || baseURL === '/') baseURL = window.location.origin;
@@ -25,10 +25,16 @@ class VBase {
     this.tokenKey = `vbase_token`;
     this.refreshTokenKey = `vbase_refresh_token`;
     this.userKey = `vbase_user`;
+    this.users = users;
 
     this._token = localStorage.getItem(this.tokenKey) || '';
     this._refreshToken = localStorage.getItem(this.refreshTokenKey) || '';
     this._user = JSON.parse(localStorage.getItem(this.userKey) || 'null');
+    this._pendingUserIDs = new Set();
+    this._loadingUserIDs = new Set();
+    this._resolvedUserIDs = new Set();
+    this._pendingUserFlush = null;
+    this._cachePublicUser(this._user);
     if (this._token) {
       this.fetchUser()
     }
@@ -56,6 +62,7 @@ class VBase {
     this._user = val;
     if (val) localStorage.setItem(this.userKey, JSON.stringify(val));
     else localStorage.removeItem(this.userKey);
+    this._cachePublicUser(val);
   }
 
   // ========== API 请求 ==========
@@ -212,6 +219,30 @@ class VBase {
     this.token = '';
     this.refreshToken = '';
     this.user = null;
+    for (const id of Object.keys(this.users)) {
+      delete this.users[id];
+    }
+    this._pendingUserIDs.clear();
+    this._loadingUserIDs.clear();
+    this._resolvedUserIDs.clear();
+    this._pendingUserFlush = null;
+  }
+
+  User(id) {
+    if (!id) return {};
+
+    if (!this.users[id]) {
+      this.users[id] = {};
+    }
+
+    if (!this._resolvedUserIDs.has(id) && !this._loadingUserIDs.has(id)) {
+      this._pendingUserIDs.add(id);
+      if (!this._pendingUserFlush) {
+        this._pendingUserFlush = Promise.resolve().then(() => this._flushUserRequests());
+      }
+    }
+
+    return this.users[id];
   }
 
   isExpired(token) {
@@ -341,6 +372,57 @@ class VBase {
       }
     );
   }
+
+  _cachePublicUser(user) {
+    if (!user?.id) return;
+
+    const cached = {
+      ...user,
+      name: user.name || user.nickname || user.username || '',
+      icon: user.icon || user.avatar || '',
+      avatar: user.avatar || user.icon || '',
+    };
+    if (!this.users[cached.id]) {
+      this.users[cached.id] = {};
+    }
+    Object.assign(this.users[cached.id], cached);
+    this._resolvedUserIDs.add(cached.id);
+    this._loadingUserIDs.delete(cached.id);
+  }
+
+  async _flushUserRequests() {
+    const ids = [...this._pendingUserIDs].filter(Boolean);
+    this._pendingUserIDs.clear();
+    this._pendingUserFlush = null;
+    if (ids.length === 0) return;
+
+    for (const id of ids) {
+      this._loadingUserIDs.add(id);
+    }
+
+    try {
+      const res = await this.request('POST', '/api/auth/users', { ids });
+      const items = Array.isArray(res?.items) ? res.items : [];
+      const found = new Set();
+
+      for (const item of items) {
+        this._cachePublicUser(item);
+        found.add(item.id);
+      }
+
+      for (const id of ids) {
+        this._loadingUserIDs.delete(id);
+        if (!found.has(id)) {
+          this._resolvedUserIDs.add(id);
+        }
+      }
+    } catch (error) {
+      for (const id of ids) {
+        this._loadingUserIDs.delete(id);
+      }
+      console.warn('VBase: batch fetch users failed', error);
+    }
+  }
 }
 
 export default VBase;