feat: add WebChat adapter for pipeline debugging (#1510)

* feat: add WebChat adapter for pipeline debugging

- Create WebChatAdapter for handling debug messages in pipeline testing
- Add HTTP API endpoints for debug message sending and retrieval
- Implement frontend debug dialog with session switching (private/group chat)
- Add Chinese i18n translations for debug interface
- Auto-create default WebChat bot during database initialization
- Support fixed session IDs: webchatperson and webchatgroup for testing

Co-Authored-By: Junyan Qin <Chin>, 秦骏言 in Chinese, you can call me my english name Rock Chin. <rockchinq@gmail.com>

* perf: ui for webchat

* feat: complete webchat backend

* feat: core chat apis

* perf: button style in pipeline card

* perf: log btn in bot card

* perf: webchat entities definition

* fix: bugs

* perf: web chat

* perf: dialog styles

* perf: styles

* perf: styles

* fix: group invalid in webchat

* perf: simulate real im message

* perf: group timeout toast

* feat(webchat): add supports for mentioning bot in group

* perf(webchat): at component styles

* perf: at badge display in message

* fix: linter errors

* fix: webchat was listed on adapter list

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Junyan Qin <Chin>, 秦骏言 in Chinese, you can call me my english name Rock Chin. <rockchinq@gmail.com>

web/src/i18n/locales/en-US.ts

@@ -183,6 +183,7 @@ const enUS = {
       'Pipelines define the processing flow for message events, used to bind to bots',
     createPipeline: 'Create Pipeline',
     editPipeline: 'Edit Pipeline',
+    chat: 'Chat',
     getPipelineListError: 'Failed to get pipeline list: ',
     daysAgo: 'days ago',
     today: 'Today',
@@ -202,6 +203,25 @@ const enUS = {
     deleteConfirmation:
       'Are you sure you want to delete this pipeline? Bots bound to this pipeline will not work.',
     defaultPipelineCannotDelete: 'Default pipeline cannot be deleted',
+    debugDialog: {
+      title: 'Pipeline Chat',
+      selectPipeline: 'Select Pipeline',
+      sessionType: 'Session Type',
+      privateChat: 'Private Chat',
+      groupChat: 'Group Chat',
+      send: 'Send',
+      reset: 'Reset Conversation',
+      inputPlaceholder: 'Enter message...',
+      noMessages: 'No messages',
+      userMessage: 'User',
+      botMessage: 'Bot',
+      sendFailed: 'Send failed',
+      resetSuccess: 'Conversation reset successfully',
+      resetFailed: 'Reset failed',
+      loadMessagesFailed: 'Failed to load messages',
+      loadPipelinesFailed: 'Failed to load pipelines',
+      atTips: 'Mention the bot',
+    },
   },
   register: {
     title: 'Initialize LangBot 👋',