fix(deploy): build index in startup event since HF Spaces ignores CMD

Dockerfile

@@ -27,4 +27,4 @@ USER user
 ENV HOME=/home/user \
     PATH=/home/user/.local/bin:$PATH
 
-CMD ["sh", "-c", "python scripts/build_index.py --languages hin --max-rows 500 && python app.py"]
+CMD ["python", "app.py"]

app.py

@@ -1,3 +1,4 @@
+import os
 import sys
 from pathlib import Path
 
@@ -23,6 +24,11 @@ def _gpu_placeholder():
 @app.on_event("startup")
 def startup_event():
     global harness
+    from app.config import settings
+    if not os.path.exists(settings.sqlite_fts_path):
+        print("Index not found. Building from HF dataset (~5-10 min)...")
+        os.system("python scripts/build_index.py --languages hin --max-rows 500")
+        print("Index build complete.")
     print("Initializing VoiceRAGHarness and preloading embedding model...")
     harness = VoiceRAGHarness()
     print("VoiceRAGHarness initialized successfully.")