fix: bare @spaces.GPU in app.py, no try/except

app.py

@@ -1,14 +1,12 @@
-try:
-    import spaces
-
-    @spaces.GPU(duration=120)
-    def _gpu_warmup():
-        # Satisfies ZeroGPU startup detection; actual inference uses @_gpu in lm.py
-        pass
-except ImportError:
-    pass
-
+import spaces
 import uvicorn
 from main import app
 
+
+@spaces.GPU
+def _gpu_warmup():
+    # Satisfies ZeroGPU startup detection; actual inference uses @_gpu in lm.py
+    pass
+
+
 uvicorn.run(app, host="0.0.0.0", port=7860)