refactor: 优化 ICHelperPanel 组件结构

- 将 1346 行的单文件拆分为 7 个职责单一的模块
   - authHelper: 认证和登录检查
   - userInfoHelper: 用户信息管理
   - conversationHelper: 会话历史加载
   - vcdHelper: VCD 文件处理
   - contextHelper: 上下文管理
   - fileHelper: 文件操作
   - messageRouter: 消息路由分发
   - 主组件精简至 157 行，提升可维护性

src/panels/helpers/userInfoHelper.ts

@@ -0,0 +1,116 @@
+/**
+ * 用户信息辅助模块
+ * 功能：管理用户信息的获取、更新和发送
+ * 依赖：vscode, userService, creditsService
+ * 使用场景：面板初始化和余额更新时
+ */
+import * as vscode from "vscode";
+import { getCachedUserInfo } from "../../services/userService";
+import { setBalanceUpdateCallback } from "../../services/creditsService";
+
+export function getTierIconUri(
+  webview: vscode.Webview,
+  context: vscode.ExtensionContext,
+  tierCode?: string,
+): string | undefined {
+  if (!tierCode) {
+    return undefined;
+  }
+
+  const tierIconMap: Record<string, string> = {
+    BASIC: "free.png",
+    TRIAL: "PRO-Try.png",
+    ADVANCED: "PRO.png",
+    PROFESSIONAL: "PRO+.png",
+  };
+
+  const iconFile = tierIconMap[tierCode];
+  if (!iconFile) {
+    return undefined;
+  }
+
+  const iconUri = webview.asWebviewUri(
+    vscode.Uri.joinPath(
+      context.extensionUri,
+      "dist",
+      "assets",
+      "titleIcon",
+      iconFile,
+    ),
+  );
+
+  return iconUri.toString();
+}
+
+export async function sendUserInfoToWebview(
+  panel: vscode.WebviewPanel,
+  context: vscode.ExtensionContext,
+) {
+  try {
+    let userInfo = getCachedUserInfo();
+
+    if (userInfo) {
+      console.log("[UserInfoHelper] 使用缓存的用户信息:", userInfo);
+      const tierIconUrl = getTierIconUri(
+        panel.webview,
+        context,
+        userInfo.membership?.tierCode,
+      );
+      panel.webview.postMessage({
+        command: "updateUserInfo",
+        userInfo: {
+          userId: userInfo.userId,
+          nickname: userInfo.nickname,
+          username: userInfo.username,
+          credits: userInfo.credits,
+          membership: userInfo.membership,
+        },
+        tierIconUrl: tierIconUrl,
+      });
+    } else {
+      const session = await vscode.authentication.getSession("iccoder", [], {
+        createIfNone: false,
+      });
+      if (session) {
+        panel.webview.postMessage({
+          command: "updateUserInfo",
+          userInfo: {
+            userId: session.account.id,
+            nickname: session.account.label,
+            username: session.account.label,
+          },
+        });
+      }
+    }
+  } catch (error) {
+    console.error("[UserInfoHelper] 获取用户信息失败:", error);
+  }
+}
+
+export function setupBalanceUpdateCallback(
+  panel: vscode.WebviewPanel,
+  context: vscode.ExtensionContext,
+) {
+  setBalanceUpdateCallback((balance: number) => {
+    const userInfo = getCachedUserInfo();
+    if (userInfo) {
+      userInfo.credits = balance;
+      const tierIconUrl = getTierIconUri(
+        panel.webview,
+        context,
+        userInfo.membership?.tierCode,
+      );
+      panel.webview.postMessage({
+        command: "updateUserInfo",
+        userInfo: {
+          userId: userInfo.userId,
+          nickname: userInfo.nickname,
+          username: userInfo.username,
+          credits: balance,
+          membership: userInfo.membership,
+        },
+        tierIconUrl: tierIconUrl,
+      });
+    }
+  });
+}