merge: merge master into feat/unified_webhook

Resolved conflicts by keeping current branch changes for webhook feature files:
- src/langbot/libs/wecom_ai_bot_api/api.py
- src/langbot/libs/wecom_ai_bot_api/wecombotevent.py
- src/langbot/pkg/api/http/controller/groups/webhooks.py
- src/langbot/pkg/platform/sources/officialaccount.py
- src/langbot/pkg/platform/sources/qqofficial.py
- src/langbot/pkg/platform/sources/wecom.py
- src/langbot/pkg/platform/sources/wecombot.py

Merged master branch changes including:
- Project restructure: moved files from pkg/ and libs/ to src/langbot/
- New features: API key auth, MCP resources, pipeline extensions
- Documentation updates: AGENTS.md, CLAUDE.md, API docs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/langbot/pkg/platform/sources/officialaccount.yaml

@@ -0,0 +1,59 @@
+apiVersion: v1
+kind: MessagePlatformAdapter
+metadata:
+  name: officialaccount
+  label:
+    en_US: Official Account
+    zh_Hans: 微信公众号
+  description:
+    en_US: Official Account Adapter
+    zh_Hans: 微信公众号适配器，请查看文档了解使用方式
+  icon: officialaccount.png
+spec:
+  config:
+    - name: token
+      label:
+        en_US: Token
+        zh_Hans: 令牌
+      type: string
+      required: true
+      default: ""
+    - name: EncodingAESKey
+      label:
+        en_US: EncodingAESKey
+        zh_Hans: 消息加解密密钥
+      type: string
+      required: true
+      default: ""
+    - name: AppID
+      label:
+        en_US: App ID
+        zh_Hans: 应用ID
+      type: string
+      required: true
+      default: ""
+    - name: AppSecret
+      label:
+        en_US: App Secret
+        zh_Hans: 应用密钥
+      type: string
+      required: true
+      default: ""
+    - name: Mode
+      label:
+        en_US: Mode
+        zh_Hans: 接入模式
+      type: string
+      required: true
+      default: "drop"
+    - name: LoadingMessage
+      label:
+        en_US: Loading Message
+        zh_Hans: 加载消息
+      type: string
+      required: true
+      default: "AI正在思考中，请发送任意内容获取回复。"
+execution:
+  python:
+    path: ./officialaccount.py
+    attr: OfficialAccountAdapter