fix: use await instead of asyncio.run for hybrid search

- Fixes 'asyncio.run() cannot be called from a running event loop' error
- Hybrid search now executes properly in async context
- Live search will now work alongside database search

src/core/use_cases/rag_chat_use_case.py

@@ -391,16 +391,14 @@ JSON:"""
             
             # Execute hybrid search (parallel live + DB)
             try:
-                db_results, live_results = asyncio.run(
-                    self.orchestrator.execute_hybrid_search(
-                        query=query,
-                        english_query=expanded_query,
-                        strategy=strategy,
-                        embedder=self.embedder,
-                        vector_store=self.vector_store,
-                        translated_queries=lang_sparse_queries,
-                        top_k=per_lang_limit
-                    )
+                db_results, live_results = await self.orchestrator.execute_hybrid_search(
+                    query=query,
+                    english_query=expanded_query,
+                    strategy=strategy,
+                    embedder=self.embedder,
+                    vector_store=self.vector_store,
+                    translated_queries=lang_sparse_queries,
+                    top_k=per_lang_limit
                 )
                 
                 print(f"DEBUG: Hybrid search returned {len(db_results)} DB + {len(live_results)} live results")