Add /v1/models endpoint (no per-user auth) for LibreChat model discovery

app/main.py

@@ -241,6 +241,21 @@ async def opencollective_webhook(request: Request):
 
 # --- B. Key injector (proxy) ---
 
+@app.get("/v1/models")
+async def list_models():
+    """List models (same for everyone — no per-user auth needed)."""
+    async with httpx.AsyncClient() as client:
+        r = await client.get(
+            f"{LITELLM_BASE}/v1/models",
+            headers={"Authorization": f"Bearer {LITELLM_MASTER_KEY}"},
+        )
+        return Response(
+            content=r.content,
+            status_code=r.status_code,
+            headers={"content-type": r.headers.get("content-type", "application/json")},
+        )
+
+
 @app.api_route("/v1/{path:path}", methods=["GET", "POST", "PUT", "DELETE", "PATCH"])
 async def inject_key(request: Request, path: str):
     """Read the member's email from a header, inject their key, forward to LiteLLM."""