added AppConfig and AppEngine

python/ebook_search/api/dependencies.py

@@ -0,0 +1,24 @@
+"""FastAPI dependencies for the EPUB search app."""
+
+from __future__ import annotations
+
+from typing import Annotated
+
+from fastapi import Depends, Request
+from sqlalchemy.engine import Engine
+
+from python.ebook_search.config import EbookSearchConfig
+
+
+def get_config(request: Request) -> EbookSearchConfig:
+    """Get the loaded search config from app state."""
+    return request.app.state.config
+
+
+def get_engine(request: Request) -> Engine:
+    """Get the database engine from app state."""
+    return request.app.state.engine
+
+
+AppConfig = Annotated[EbookSearchConfig, Depends(get_config)]
+AppEngine = Annotated[Engine, Depends(get_engine)]