feat: 实现试用用户欢迎引导和过期检测功能

- 新增试用用户首次登录欢迎弹窗，展示使用教程
- 新增试用期过期检测服务和过期提醒弹窗
- 从 JWT token 中提取 ispluginTrial 标识判断用户类型
- 试用用户跳过邀请码验证流程
- 在消息发送前检查试用期是否过期
- 新增 ExpiredPanel 和 WelcomePanel 面板组件
- 新增 expiredModal 和 welcomeModal 视图组件
- 优化用户登录流程，根据用户类型显示不同引导

src/views/webviewContent.ts

@@ -30,6 +30,16 @@ import {
   getInvitationModalStyles,
   getInvitationModalScript,
 } from "./invitationModal";
+import {
+  getWelcomeModalContent,
+  getWelcomeModalStyles,
+  getWelcomeModalScript,
+} from "./welcomeModal";
+import {
+  getExpiredModalContent,
+  getExpiredModalStyles,
+  getExpiredModalScript,
+} from "./expiredModal";
 /**
  * 获取 WebView 面板的 HTML 内容
  */
@@ -100,6 +110,8 @@ export function getWebviewContent(
     ${getProgressBarStyles()}
     ${getInputAreaStyles()}
     ${getInvitationModalStyles()}
+    ${getWelcomeModalStyles()}
+    ${getExpiredModalStyles()}
 
     .file-editor-section {
       margin-bottom: 15px;
@@ -466,6 +478,8 @@ export function getWebviewContent(
   ${getConversationHistoryBarContent()}
   ${getProgressBarContent()}
   ${getInvitationModalContent(qrCodeUri, logoUri)}
+  ${getWelcomeModalContent(logoUri)}
+  ${getExpiredModalContent(logoUri)}
   <div class="header">
     <div style="display: flex; align-items: center; justify-content: center;">
       <img src="${logoUri}" alt="IC Coder" style="max-width: 100%; height: auto; max-height: 80px;" />
@@ -873,6 +887,8 @@ export function getWebviewContent(
     ${getProgressBarScript()}
     ${getInputAreaScript()}
     ${getInvitationModalScript()}
+    ${getWelcomeModalScript()}
+    ${getExpiredModalScript()}
   </script></body>
 </html>`;
 }