Remove API key env vars — keys come from DB via request payload

API keys (Anthropic, OpenAI etc.) are stored in the inference_endpoints
table and passed through the request from gnommoweb. Removed the
API_KEY_ANTHROPIC / AGENT_INFERENCE_MODEL env var fallbacks entirely.
Missing endpoint config now returns a clear error instead of silently
falling back to a hardcoded model.

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

server.py

@@ -42,13 +42,8 @@ import litellm
 
 # --- Config ---
 API_KEY            = os.getenv("AGENT_INFERENCE_KEY", "agent-inference-dev-key")
-FALLBACK_MODEL     = os.getenv("AGENT_INFERENCE_MODEL", "anthropic/claude-sonnet-4-20250514")
-ANTHROPIC_KEY      = os.getenv("API_KEY_ANTHROPIC", "")
 AGENT_MAX_MESSAGES = int(os.getenv("AGENT_INFERENCE_MAX_MESSAGES", "10"))
 
-if ANTHROPIC_KEY:
-    os.environ["ANTHROPIC_API_KEY"] = ANTHROPIC_KEY
-
 logging.basicConfig(level=logging.INFO)
 log = logging.getLogger("agent-inference")
 
@@ -529,7 +524,7 @@ app = FastAPI(title="Agent Inference Service", version="1.2.0")
 
 @app.get("/health")
 async def health():
-    return {"status": "ok", "service": "agent-inference", "fallback_model": FALLBACK_MODEL}
+    return {"status": "ok", "service": "agent-inference"}
 
 
 @app.post("/v1/agent/chat", response_model=ChatResponse)
@@ -559,12 +554,19 @@ async def agent_chat(req: ChatRequest, authorization: str = Header(default="")):
         return await handle_agent0_mcp(req, agent, model, valid_poses)
 
     # ── Route: standard LLM via litellm ──────────────────────────────────────
-    model_id = model.model_id if model else FALLBACK_MODEL
-    api_base = model.endpoint  if model else None
-    api_key  = model.api_key   if model else None
+    if not model or not model.model_id:
+        log.error(f"[{agent.name}] No inference endpoint configured for this agent")
+        return ChatResponse(
+            letter_id=0,
+            timestamp=int(time.time()),
+            message="*configuration error* No inference endpoint configured for this agent.",
+            pose=valid_poses[0],
+            conversation_id=req.conversation_id,
+        )
 
-    if not model_id:
-        model_id = FALLBACK_MODEL
+    model_id = model.model_id
+    api_base = model.endpoint
+    api_key  = model.api_key
 
     total_messages = len(req.history) + 1
     system_prompt  = build_system_prompt(agent, message_count=total_messages)