Форматирование кода, добавление лого, исправление тестов, улучшение эндпоинтов и документации

tests/mock_app.py

@@ -0,0 +1,26 @@
+from fastapi import FastAPI
+from tests.mock_routers import books, authors, genres, relationships
+from library_service.routers.misc import router as misc_router
+
+
+def create_mock_app() -> FastAPI:
+    """Create FastAPI app with mock routers for testing"""
+    app = FastAPI(
+        title="Library API Test",
+        description="Library API for testing without database",
+        version="1.0.0",
+    )
+
+    # Include mock routers
+    app.include_router(books.router)
+    app.include_router(authors.router)
+    app.include_router(genres.router)
+    app.include_router(relationships.router)
+
+    # Include real misc router (it doesn't use database)
+    app.include_router(misc_router)
+
+    return app
+
+
+mock_app = create_mock_app()