feat: enhance agent orchestration, knowledge flow and UI refinements

backend/app/schemas/agent.py

@@ -41,6 +41,7 @@ class AgentConfigUpdate(BaseModel):
     description: str | None = None
     system_prompt: str | None = None
     enabled: bool | None = None
+    selected_skill_ids: list[str] | None = None
 
 
 class AgentConfigOut(BaseModel):
@@ -51,5 +52,6 @@ class AgentConfigOut(BaseModel):
     system_prompt: str
     enabled: bool
     is_active: bool
+    selected_skill_ids: list[str]
 
     model_config = {"from_attributes": True}