feat: 浏览器扩展支持交互式页面操作 (browser_act)

在原有只读抓取 (browser_fetch_page) 基础上，新增 observe→act 循环，
让 Agent 能在用户的 Chrome 中实际操作网页：点击/输入/滚动/等待/页内跳转。

后端：
- 新工具 browser_act，按 session 复用标签页，返回带编号的可交互元素清单+正文
- browser_context 任务队列扩展 kind/session_id/action 与 observation 结果
- /api/browser-context 路由下发 act 任务、接收 observation
- BrowserContextConfig 增加 actions_enabled 等开关，tools.py 两级门控
- 接线 app.py 路由挂载、app_config.py 配置字段、config.yaml 工具注册

前端：
- ChatPage 处理「发送当前页」回跳的 browser_context query 参数并自动提交

扩展 (browser-extension/deer-web-clipper)：
- shared.js 自包含注入函数 deerObservePage / deerPerformAction
- background.js 按 kind 分发任务，session→tab 映射存 chrome.storage.session

测试：tests/test_browser_act.py（队列往返 + 工具校验 + 模拟扩展成功路径，8 passed）

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

offline-backend-20260512/backend/config.yaml

@@ -10,90 +10,90 @@ gateway:
   port: 8001
 
 models:
-  - name: deepseek-chat
-    display_name: DeepSeek Chat
-    use: langchain_openai:ChatOpenAI
-    model: deepseek-chat
-    api_key: sk-1520028668cb4cc388ed8315ff1e856e
-    base_url: https://api.deepseek.com
-    request_timeout: 600.0
-    max_retries: 2
-    max_tokens: 4096
-    temperature: 1.0
-    supports_vision: false
-    supports_thinking: true
+  # - name: deepseek-chat
+  #   display_name: DeepSeek Chat
+  #   use: langchain_openai:ChatOpenAI
+  #   model: deepseek-chat
+  #   api_key: sk-1520028668cb4cc388ed8315ff1e856e
+  #   base_url: https://api.deepseek.com
+  #   request_timeout: 600.0
+  #   max_retries: 2
+  #   max_tokens: 4096
+  #   temperature: 1.0
+  #   supports_vision: false
+  #   supports_thinking: true
 
-  - name: deepseek-v4-flash
-    display_name: DeepSeek V4 Flash
-    use: langchain_openai:ChatOpenAI
-    model: deepseek-v4-flash
-    api_key: sk-e1c22b7931dc446f8b67e57878edd105
-    base_url: https://api.deepseek.com
-    request_timeout: 600.0
-    max_retries: 2
-    max_tokens: 4096
-    temperature: 1.0
-    supports_vision: false
-    supports_thinking: true
+  # - name: deepseek-v4-flash
+  #   display_name: DeepSeek V4 Flash
+  #   use: langchain_openai:ChatOpenAI
+  #   model: deepseek-v4-flash
+  #   api_key: sk-e1c22b7931dc446f8b67e57878edd105
+  #   base_url: https://api.deepseek.com
+  #   request_timeout: 600.0
+  #   max_retries: 2
+  #   max_tokens: 4096
+  #   temperature: 1.0
+  #   supports_vision: false
+  #   supports_thinking: true
 
-  - name: deepseek-v4-pro
-    display_name: DeepSeek V4 Pro
+  # - name: deepseek-v4-pro
+  #   display_name: DeepSeek V4 Pro
+  #   use: langchain_openai:ChatOpenAI
+  #   model: deepseek-v4-pro
+  #   api_key: sk-e1c22b7931dc446f8b67e57878edd105
+  #   base_url: https://api.deepseek.com
+  #   request_timeout: 600.0
+  #   max_retries: 2
+  #   max_tokens: 4096
+  #   temperature: 1.0
+  #   supports_vision: false
+  #   supports_thinking: true
+  # - name: MiniMax-M2.7
+  #   display_name: MiniMax-M2.7
+  #   use: langchain_openai:ChatOpenAI
+  #   model: MiniMax-M2.7
+  #   api_key: sk-cp-mrsAGtzDpUl0TpOBPVoiRG_pWF1kDDN9_mDAnONBs6HIPcNUexSKtSbx2QOxfKBvJT6Xw6hDTV6hdkJYFWfNA8UtHQ08TiGJiosdRoW6q1sGb6Cb7D85NHk
+  #   base_url: https://api.minimaxi.com/v1
+  #   max_tokens: 4096
+  #   temperature: 1.0
+  #   supports_vision: true
+  #   supports_thinking: true
+  # - name: glm-5.1
+  #   display_name: glm-5.1
+  #   use: langchain_openai:ChatOpenAI
+  #   model: glm-5.1
+  #   api_key: 75121e4bed7640d5b71ac95cf8b4310a.RA3GyRBAR3kv7VrR
+  #   base_url: https://open.bigmodel.cn/api/paas/v4/
+  #   max_tokens: 4096
+  #   temperature: 1.0
+  #   supports_vision: true
+  #   supports_thinking: true
+  # - name: deepseek-ai/DeepSeek-OCR
+  #   display_name: deepseek-ai/DeepSeek-OCR
+  #   use: langchain_openai:ChatOpenAI
+  #   model: deepseek-ai/DeepSeek-OCR
+  #   api_key: sk-beshfxfxfrllsczpqfrgjbugfbpzxgqgedbehceytpcvvtyb
+  #   base_url: https://api.siliconflow.cn/v1/
+  #   max_tokens: 4096
+  #   temperature: 1.0
+  #   supports_vision: true
+  #   supports_thinking: true
+  # - name: zai-org/GLM-5-FP8
+  #   display_name: zai-org/GLM-5-FP8
+  #   use: langchain_openai:ChatOpenAI
+  #   model: zai-org/GLM-5-FP8
+  #   api_key: modalresearch_gWu46FDpVLYZWPVEA3b_2fq8Jw2UJiKMgEm_Rxmn1SA
+  #   base_url: https://api.us-west-2.modal.direct/v1
+  #   request_timeout: 600.0
+  #   max_retries: 2
+  #   max_tokens: 4096
+  #   temperature: 1.0
+  #   supports_vision: true
+  #   supports_thinking: true
+  - name: deepseek-ai/DeepSeek-V4-Flash
+    display_name: deepseek-ai/DeepSeek-V4-Flash
     use: langchain_openai:ChatOpenAI
-    model: deepseek-v4-pro
-    api_key: sk-e1c22b7931dc446f8b67e57878edd105
-    base_url: https://api.deepseek.com
-    request_timeout: 600.0
-    max_retries: 2
-    max_tokens: 4096
-    temperature: 1.0
-    supports_vision: false
-    supports_thinking: true
-  - name: MiniMax-M2.7
-    display_name: MiniMax-M2.7
-    use: langchain_openai:ChatOpenAI
-    model: MiniMax-M2.7
-    api_key: sk-cp-mrsAGtzDpUl0TpOBPVoiRG_pWF1kDDN9_mDAnONBs6HIPcNUexSKtSbx2QOxfKBvJT6Xw6hDTV6hdkJYFWfNA8UtHQ08TiGJiosdRoW6q1sGb6Cb7D85NHk
-    base_url: https://api.minimaxi.com/v1
-    max_tokens: 4096
-    temperature: 1.0
-    supports_vision: true
-    supports_thinking: true
-  - name: glm-5.1
-    display_name: glm-5.1
-    use: langchain_openai:ChatOpenAI
-    model: glm-5.1
-    api_key: 75121e4bed7640d5b71ac95cf8b4310a.RA3GyRBAR3kv7VrR
-    base_url: https://open.bigmodel.cn/api/paas/v4/
-    max_tokens: 4096
-    temperature: 1.0
-    supports_vision: true
-    supports_thinking: true
-  - name: deepseek-ai/DeepSeek-OCR
-    display_name: deepseek-ai/DeepSeek-OCR
-    use: langchain_openai:ChatOpenAI
-    model: deepseek-ai/DeepSeek-OCR
-    api_key: sk-beshfxfxfrllsczpqfrgjbugfbpzxgqgedbehceytpcvvtyb
-    base_url: https://api.siliconflow.cn/v1/
-    max_tokens: 4096
-    temperature: 1.0
-    supports_vision: true
-    supports_thinking: true
-  - name: zai-org/GLM-5-FP8
-    display_name: zai-org/GLM-5-FP8
-    use: langchain_openai:ChatOpenAI
-    model: zai-org/GLM-5-FP8
-    api_key: modalresearch_gWu46FDpVLYZWPVEA3b_2fq8Jw2UJiKMgEm_Rxmn1SA
-    base_url: https://api.us-west-2.modal.direct/v1
-    request_timeout: 600.0
-    max_retries: 2
-    max_tokens: 4096
-    temperature: 1.0
-    supports_vision: true
-    supports_thinking: true
-  - name: Qwen/Qwen3.6-27B
-    display_name: Qwen/Qwen3.6-27B
-    use: langchain_openai:ChatOpenAI
-    model: Qwen/Qwen3.6-27B
+    model: deepseek-ai/DeepSeek-V4-Flash
     api_key:  sk-ighylafootabtuthwueirmoycccyqtdgbifyhozduvolkdyt
     base_url: https://api.siliconflow.cn/v1/
     max_tokens: 4096
@@ -122,6 +122,26 @@ uploads:
   auto_convert_documents: true
   pdf_converter: auto
 
+# Chrome 插件「当前网页发送到 Deer」入口。默认关闭，打开后才启用
+# /api/browser-context/capture。它只保存当前页 Markdown 到线程 uploads，
+# 不会改变普通聊天、上传或工具调用流程。
+browser_context:
+  enabled: true
+  max_content_chars: 200000
+  max_title_chars: 300
+  max_url_chars: 2048
+  filename_prefix: webpage
+  route_base: /page/workspace
+  task_result_timeout_seconds: 60
+  task_poll_interval_seconds: 1
+  task_lease_seconds: 120
+  tool_result_max_chars: 60000
+  # 交互式页面操作（browser_act：点击/输入/滚动/等待/跳转）。关闭后只保留只读抓取。
+  actions_enabled: true
+  action_result_timeout_seconds: 45
+  max_observed_elements: 150
+  observation_text_max_chars: 12000
+
 title:
   enabled: true
   max_words: 6
@@ -139,6 +159,7 @@ title:
 
 tool_groups:
   - name: web
+  - name: browser
   - name: file:read
   - name: file:write
   - name: bash
@@ -154,6 +175,14 @@ tools:
     use: deerflow.community.jina_ai.tools:web_fetch_tool
     timeout: 15
 
+  - name: browser_fetch_page
+    group: browser
+    use: deerflow.tools.builtins.browser_context_tool:browser_fetch_page_tool
+
+  - name: browser_act
+    group: browser
+    use: deerflow.tools.builtins.browser_act_tool:browser_act_tool
+
   - name: ls
     group: file:read
     use: deerflow.sandbox.tools:ls_tool