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/api/v1/analytics.py

@@ -1,4 +1,5 @@
 """Analytics API endpoints for summaries and funnels."""
+
 from __future__ import annotations
 
 from decimal import Decimal
@@ -16,6 +17,7 @@ def _decimal_to_str(value: Decimal) -> str:
     normalized = value.normalize()
     return format(normalized, "f")
 
+
 router = APIRouter(prefix="/analytics", tags=["analytics"])
 
 
@@ -92,4 +94,6 @@ async def deals_funnel(
     """Return funnel breakdown by stages and statuses."""
 
     breakdowns: list[StageBreakdown] = await service.get_deal_funnel(context.organization_id)
-    return DealFunnelResponse(stages=[StageBreakdownModel.model_validate(item) for item in breakdowns])
+    return DealFunnelResponse(
+        stages=[StageBreakdownModel.model_validate(item) for item in breakdowns]
+    )