Feat: Add Hermes brain change buttons and skills.sh guide source

backend/routers/agent.py

@@ -1,12 +1,23 @@
 """Agent-Endpoint: Hermes-Status + WebUI-Link (MC verlinkt nur, betreibt nicht)."""
 
 from fastapi import APIRouter
+from pydantic import BaseModel
 
-from services.agent import agent_status
+from services.agent import agent_status, update_brain_model
 
 router = APIRouter(prefix="/api")
 
 
+class BrainReq(BaseModel):
+    model: str
+
+
 @router.get("/agent/status")
 def status() -> dict:
     return agent_status()
+
+
+@router.post("/agent/brain")
+def set_brain_model(body: BrainReq) -> dict:
+    ok = update_brain_model(body.model)
+    return {"ok": ok}