feat(api): add logging configuration and mount routers

Why:
- Need structured logging for debugging query pipeline
- Need to mount benchmarking router

Changes:
- Added logging.basicConfig() with INFO level
- Mounted benchmarking router
- Registered QueryError exception handler

src/main.py

@@ -1,17 +1,28 @@
 """FastAPI app factory. Composes all domain routers and middleware."""
 
+import logging
+
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from src.core.exceptions import (
     ChunkingError,
     BenchmarkError,
+    QueryError,
     chunking_exception_handler,
     benchmark_exception_handler,
 )
 from src.documents.routes import router as documents_router
+from src.benchmarking.routes import router as benchmarking_router
 from src.storage.sqlite import init_db
 
+# Configure logging
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
+    datefmt="%Y-%m-%d %H:%M:%S",
+)
+
 
 def create_app() -> FastAPI:
     """Create and configure the FastAPI application.
@@ -40,9 +51,11 @@ def create_app() -> FastAPI:
     # Register exception handlers
     app.add_exception_handler(ChunkingError, chunking_exception_handler)
     app.add_exception_handler(BenchmarkError, benchmark_exception_handler)
+    app.add_exception_handler(QueryError, benchmark_exception_handler)
 
     # Mount domain routers
     app.include_router(documents_router)
+    app.include_router(benchmarking_router)
 
     return app