fix: Ensure @spaces.GPU function detection at module level

- Move GPU/CPU function calls to module level for early detection
- Ensures Hugging Face Spaces detects @spaces.GPU during startup
- Fixes "no @spaces.GPU function detected during startup" error

🤖 Generated with [Claude Code](https://claude.ai/code)

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

app.py

@@ -102,6 +102,10 @@ def _dummy_cpu_function():
     """Dummy function to satisfy Spaces CPU detection"""
     return "CPU available"
 
+# Initialize functions at module level for Spaces detection
+_gpu_init = _dummy_gpu_function()
+_cpu_init = _dummy_cpu_function()
+
 import asyncio
 import threading
 import json
@@ -1021,10 +1025,8 @@ with gr.Blocks(
 def safe_main():
     """Main function with comprehensive error handling and stream protection"""
     try:
-        # Initialize Spaces functions for startup detection
-        gpu_status = _dummy_gpu_function()
-        cpu_status = _dummy_cpu_function()
-        print(f"[TTS-INFO] {gpu_status}, {cpu_status}", flush=True)
+        # Spaces functions already initialized at module level
+        print(f"[TTS-INFO] {_gpu_init}, {_cpu_init}", flush=True)
         
         # === FINAL SAFETY MEASURES ===
         # Last-chance protection against any remaining stream conflicts