Refactor code for improved readability and consistency

- Reformatted function signatures in `organization_service.py` and `task_service.py` for better alignment.
- Updated import statements across multiple files for consistency and organization.
- Enhanced test files by improving formatting and ensuring consistent use of async session factories.
- Added type hints and improved type safety in various service and test files.
- Adjusted `pyproject.toml` to include configuration for isort, mypy, and ruff for better code quality checks.
- Cleaned up unused imports and organized existing ones in several test files.

app/main.py

@@ -7,6 +7,7 @@ from contextlib import asynccontextmanager
 from pathlib import Path
 
 from fastapi import FastAPI, HTTPException
+from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import FileResponse
 from fastapi.staticfiles import StaticFiles
 
@@ -14,13 +15,12 @@ from app.api.routes import api_router
 from app.core.cache import init_cache, shutdown_cache
 from app.core.config import settings
 from app.core.middleware.cache_monitor import CacheAvailabilityMiddleware
-from fastapi.middleware.cors import CORSMiddleware
-
 
 PROJECT_ROOT = Path(__file__).resolve().parent.parent
 FRONTEND_DIST = PROJECT_ROOT / "frontend" / "dist"
 FRONTEND_INDEX = FRONTEND_DIST / "index.html"
 
+
 def create_app() -> FastAPI:
     """Build FastAPI application instance."""
 
@@ -43,7 +43,7 @@ def create_app() -> FastAPI:
             # "http://localhost:8000",
             # "http://0.0.0.0:8000",
             # "http://127.0.0.1:8000",
-            "*" # ! TODO: Убрать
+            "*",  # ! TODO: Убрать
         ],
         allow_credentials=True,
         allow_methods=["*"],  # Разрешить все HTTP-методы
@@ -59,7 +59,9 @@ def create_app() -> FastAPI:
             return FileResponse(FRONTEND_INDEX)
 
         @application.get("/{path:path}", include_in_schema=False)
-        async def serve_frontend_path(path: str) -> FileResponse:  # pragma: no cover - simple file response
+        async def serve_frontend_path(
+            path: str,
+        ) -> FileResponse:  # pragma: no cover - simple file response
             if path == "" or path.startswith("api"):
                 raise HTTPException(status_code=404)