refactor: replace SessionDep with explicit Annotated[Session, Depends(get_session)] across all routers

- Replace SessionDep type alias with explicit Annotated[Session, Depends(get_session)]
- Add missing imports for Session, Annotated, and Depends types
- Update all endpoint function signatures to use explicit dependency annotation
- Remove redundant `= Depends()` default values from session parameters
- Update docstrings and comments to reference new annotation pattern
- Apply changes consistently across all router

apps/coordinator-api/src/app/main.py

@@ -1,7 +1,9 @@
+from sqlalchemy.orm import Session
+from typing import Annotated
 from slowapi import Limiter, _rate_limit_exceeded_handler
 from slowapi.util import get_remote_address
 from slowapi.errors import RateLimitExceeded
-from fastapi import FastAPI, Request
+from fastapi import FastAPI, Request, Depends
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import JSONResponse, Response
 from fastapi.exceptions import RequestValidationError
@@ -201,7 +203,7 @@ def create_app() -> FastAPI:
         docs_url="/docs",
         redoc_url="/redoc",
         lifespan=lifespan,
-        # Custom OpenAPI config to handle SessionDep issues
+        # Custom OpenAPI config to handle Annotated[Session, Depends(get_session)] issues
         openapi_components={
             "securitySchemes": {
                 "ApiKeyAuth": {