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.

pyproject.toml

@@ -24,3 +24,64 @@ dev = [
     "pytest-asyncio>=0.25.0",
     "aiosqlite>=0.20.0",
 ]
+
+[tool.isort]
+profile = "black"
+line_length = 100
+combine_as_imports = true
+default_section = "THIRDPARTY"
+known_first_party = ["app", "tests"]
+skip_glob = ["migrations/*"]
+
+[tool.mypy]
+python_version = "3.14"
+plugins = ["pydantic.mypy"]
+warn_unused_configs = true
+warn_return_any = true
+warn_unused_ignores = true
+disallow_untyped_defs = true
+disallow_untyped_calls = true
+disallow_any_unimported = true
+no_implicit_optional = true
+strict_optional = true
+show_error_codes = true
+exclude = ["migrations/"]
+
+[[tool.mypy.overrides]]
+module = ["tests.*"]
+ignore_missing_imports = true
+allow_untyped_defs = true
+
+[tool.ruff]
+line-length = 100
+target-version = "py310"
+src = ["app", "migrations", "tests"]
+
+[tool.ruff.lint]
+select = [
+    "E",
+    "F",
+    "W",
+    "B",
+    "UP",
+    "I",
+    "N",
+    "S",
+    "Q",
+    "C4",
+    "COM",
+    "DTZ",
+    "G",
+    "TID",
+]
+ignore = ["E203", "E266", "E501", "S101"]
+
+[tool.ruff.lint.per-file-ignores]
+"tests/**/*" = ["S311"]
+"migrations/*" = ["B008", "DTZ001", "TID252"]
+
+[tool.ruff.format]
+quote-style = "double"
+indent-style = "space"
+skip-magic-trailing-comma = false
+line-ending = "auto"