fix: add root route to avoid 404

llmopt/api/app.py

@@ -84,6 +84,15 @@ class ExplainRequest(BaseModel):
 # Endpoints
 # ---------------------------------------------------------------------------
 
+@app.get("/")
+def root():
+    return {
+        "message": "LLMOpt V2 API is running!",
+        "docs": "/docs",
+        "health": "/health"
+    }
+
+
 @app.get("/health")
 def health():
     return {"status": "ok", "version": "0.1.0"}