Add /v1/models endpoint for Open WebUI integration

Open WebUI requires this endpoint to discover and list available models
from OpenAI-compatible connections.

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

main.py

@@ -60,6 +60,20 @@ class IndexRequest(BaseModel):
     root_dir: str
     extensions: list[str] = [".py"]
 
+# ── models list endpoint ──────────────────────────────────────────────────────
+
+@app.get("/v1/models")
+async def list_models():
+    return {
+        "object": "list",
+        "data": [{
+            "id": "code-memory",
+            "object": "model",
+            "owned_by": "code-memory",
+            "created": 1700000000,
+        }]
+    }
+
 # ── context assembly ──────────────────────────────────────────────────────────
 
 async def build_context(request: ChatRequest) -> list[dict]: