feat: 交互Agent + VLM优化 + 企微演示模式

- 新增交互Agent调度器（意图识别 + 工单/查询/报表/闲聊4个Handler）
- 新增工单服务、Excel报表生成器、企微消息加解密模块
- VLM提示词优化（角色设定、≤25字描述、布尔值优先输出）
- VLM降级策略（入侵默认放行、离岗默认拦截）
- 企微演示模式（WECHAT_TEST_UIDS兜底 + SERVICE_BASE_URL修复）
- 新增Agent回调路由和测试接口

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/config.py

@@ -60,6 +60,18 @@ class WeChatConfig:
     token: str = ""
     encoding_aes_key: str = ""
     enabled: bool = False
+    test_uids: str = ""        # 演示模式：逗号分隔的企微userid，如 "zhangsan,lisi"
+    service_base_url: str = "" # H5页面公网地址，如 https://vsp.viewshanghai.com
+
+
+@dataclass
+class AgentConfig:
+    """交互Agent配置"""
+    llm_api_key: str = ""
+    llm_base_url: str = "https://dashscope.aliyuncs.com/compatible-mode/v1"
+    llm_model: str = "qwen-plus"
+    llm_timeout: int = 15
+    enabled: bool = False
 
 
 @dataclass
@@ -110,6 +122,7 @@ class Settings(BaseModel):
     ai_model: AIModelConfig = AIModelConfig()
     vlm: VLMConfig = VLMConfig()
     wechat: WeChatConfig = WeChatConfig()
+    agent: AgentConfig = AgentConfig()
     redis: RedisConfig = RedisConfig()
     camera_name: CameraNameConfig = CameraNameConfig()
 
@@ -155,6 +168,15 @@ def load_settings() -> Settings:
             token=os.getenv("WECHAT_TOKEN", ""),
             encoding_aes_key=os.getenv("WECHAT_ENCODING_AES_KEY", ""),
             enabled=os.getenv("WECHAT_ENABLED", "false").lower() == "true",
+            test_uids=os.getenv("WECHAT_TEST_UIDS", ""),
+            service_base_url=os.getenv("SERVICE_BASE_URL", ""),
+        ),
+        agent=AgentConfig(
+            llm_api_key=os.getenv("DASHSCOPE_API_KEY", ""),
+            llm_base_url=os.getenv("AGENT_LLM_BASE_URL", "https://dashscope.aliyuncs.com/compatible-mode/v1"),
+            llm_model=os.getenv("AGENT_LLM_MODEL", "qwen-plus"),
+            llm_timeout=int(os.getenv("AGENT_LLM_TIMEOUT", "15")),
+            enabled=os.getenv("AGENT_ENABLED", "false").lower() == "true",
         ),
         redis=RedisConfig(
             host=os.getenv("REDIS_HOST", "localhost"),