feat(context-enhancement): 新增 chatId 与 threadId 来源字段 (#128)

Add chatId and threadId source fields across all nine IM channels, update UI/docs/tests, reconcile the latest main branch, and credit @Chan-0312 as a contributor.

src/channels/wecom/wecom-bridge.mjs

@@ -1056,6 +1056,7 @@ export class WecomHarnessBridge {
         content = enhanceContextContent(originalContent, snapshot, () => ({
           channel: 'wecom',
           senderId,
+          chatId,
         }));
         contextEnhanced = content !== originalContent;
       }