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/repositories/analytics_repo.py

@@ -1,4 +1,5 @@
 """Analytics-specific data access helpers."""
+
 from __future__ import annotations
 
 from dataclasses import dataclass
@@ -58,7 +59,7 @@ class AnalyticsRepository:
                     deal_count=int(count or 0),
                     amount_sum=_to_decimal(amount_sum),
                     amount_count=int(amount_count or 0),
-                )
+                ),
             )
         return rollup