feat(project-currency): implement project-specific currency support

- Added a currency column to the projects table to allow different projects to use different currencies.
- Updated existing projects to default to 'USD' if no currency is set.
- Enhanced project finance controller to handle currency retrieval and updates.
- Introduced API endpoints for updating project currency with validation.
- Updated frontend components to display and manage project currency effectively.

worklenz-backend/database/sql/1_tables.sql

@@ -783,9 +783,12 @@ CREATE TABLE IF NOT EXISTS projects (
     estimated_working_days INTEGER                  DEFAULT 0,
     use_manual_progress    BOOLEAN                  DEFAULT FALSE,
     use_weighted_progress  BOOLEAN                  DEFAULT FALSE,
-    use_time_progress      BOOLEAN                  DEFAULT FALSE
+    use_time_progress      BOOLEAN                  DEFAULT FALSE,
+    currency               VARCHAR(3)               DEFAULT 'USD'
 );
 
+COMMENT ON COLUMN projects.currency IS 'Project-specific currency code (e.g., USD, EUR, GBP, JPY, etc.)';
+
 ALTER TABLE projects
     ADD CONSTRAINT projects_pk
         PRIMARY KEY (id);