Add FastAPI app files with Qwen3 integration

app.py

@@ -0,0 +1,25 @@
+import os
+from fastapi import FastAPI, Request
+from pydantic import BaseModel
+from openai import OpenAI
+
+app = FastAPI()
+
+client = OpenAI(
+    base_url="https://router.huggingface.co/v1",
+    api_key=os.environ["HF_TOKEN"],
+)
+
+class Query(BaseModel):
+    question: str
+
+@app.post("/ask")
+async def ask_model(query: Query):
+    completion = client.chat.completions.create(
+        model="Qwen/Qwen3-4B-Thinking-2507:nscale",
+        messages=[
+            {"role": "user", "content": query.question}
+        ],
+    )
+    answer = completion.choices[0].message.content
+    return {"answer": answer}