Fix: top-level import spaces and @spaces.GPU(duration=30) for HF ZeroGPU

app.py

@@ -17,14 +17,12 @@ from fastapi import FastAPI, HTTPException, Request, Header, Depends, File, Uplo
 from fastapi.responses import JSONResponse, RedirectResponse, Response
 from fastapi.middleware.cors import CORSMiddleware
 from pydantic import BaseModel, Field
-try:
-    import spaces
-    @spaces.GPU
-    def zero_gpu_keepalive():
-        """Satisfies HF ZeroGPU startup check."""
-        return "ZeroGPU active"
-except Exception as e:
-    print(f"Notice: ZeroGPU spaces module not imported ({e}). Running in standard environment.")
+import spaces
+
+@spaces.GPU(duration=30)
+def zero_gpu_keepalive(query: str = "keepalive"):
+    """ZeroGPU keepalive function required by HF ZeroGPU runtime."""
+    return f"ZeroGPU active: {query}"
 
 # ── RIF Engine (Pure CPU, O(1) Memory) ──────────────────────────
 class RIFEngine: