feat(task-breakdown-api): implement task financial breakdown API and related enhancements

- Added a new API endpoint `GET /api/project-finance/task/:id/breakdown` to retrieve detailed financial breakdown for individual tasks, including labor hours and costs grouped by job roles.
- Introduced a new SQL migration to add a `fixed_cost` column to the tasks table for improved financial calculations.
- Updated the project finance controller to handle task breakdown logic, including calculations for estimated and actual costs.
- Enhanced frontend components to integrate the new task breakdown API, providing real-time financial data in the finance drawer.
- Updated localization files to reflect changes in financial terminology across English, Spanish, and Portuguese.
- Implemented Redux state management for selected tasks in the finance drawer.

worklenz-backend/database/migrations/20250520000000-add-fixed-cost-to-tasks.sql

@@ -0,0 +1,6 @@
+-- Add fixed_cost column to tasks table for project finance functionality
+ALTER TABLE tasks 
+ADD COLUMN fixed_cost DECIMAL(10, 2) DEFAULT 0 CHECK (fixed_cost >= 0);
+
+-- Add comment to explain the column
+COMMENT ON COLUMN tasks.fixed_cost IS 'Fixed cost for the task in addition to hourly rate calculations';