Fix: Use NoOpCache by default (no Redis on HF)

app/presentation/api/v1/endpoints.py

@@ -57,16 +57,9 @@ async def get_query_use_case() -> QueryProcessingUseCase:
     llm = GeminiLLM(api_key=settings.gemini_api_key, model_name=settings.gemini_model)
     prompt_builder = DefaultPromptBuilder()
     
-    # Use NoOpCache if Redis unavailable
-    try:
-        from app.infrastructure.cache.redis_cache import RedisCache
-        cache = RedisCache(redis_url=settings.redis_url)
-        # Test connection
-        await cache.get("test_key")
-    except Exception:
-        logger.warning("redis_unavailable", msg="Falling back to NoOpCache")
-        from app.infrastructure.cache.noop_cache import NoOpCache
-        cache = NoOpCache()
+    # Always use NoOpCache for demo (Redis not available on HF Spaces)
+    from app.infrastructure.cache.noop_cache import NoOpCache
+    cache = NoOpCache()
 
     # For now, using a simple reranker (in production use cross-encoder)
     from app.infrastructure.external.simple_reranker import SimpleReranker