feat: Enhance project and scenario creation with monitoring metrics

- Added monitoring metrics for project creation success and error handling in `ProjectRepository`.
- Implemented similar monitoring for scenario creation in `ScenarioRepository`.
- Refactored `run_monte_carlo` function in `simulation.py` to include timing and success/error metrics.
- Introduced new CSS styles for headers, alerts, and navigation buttons in `main.css` and `projects.css`.
- Created a new JavaScript file for navigation logic to handle chevron buttons.
- Updated HTML templates to include new navigation buttons and improved styling for buttons.
- Added tests for reporting service and routes to ensure proper functionality and access control.
- Removed unused imports and optimized existing test files for better clarity and performance.

main.py

@@ -6,13 +6,8 @@ from fastapi.staticfiles import StaticFiles
 
 from config.settings import get_settings
 from middleware.auth_session import AuthSessionMiddleware
+from middleware.metrics import MetricsMiddleware
 from middleware.validation import validate_json
-from models import (
-    FinancialInput,
-    Project,
-    Scenario,
-    SimulationParameter,
-)
 from routes.auth import router as auth_router
 from routes.dashboard import router as dashboard_router
 from routes.imports import router as imports_router
@@ -26,6 +21,7 @@ from services.bootstrap import bootstrap_admin, bootstrap_pricing_settings
 app = FastAPI()
 
 app.add_middleware(AuthSessionMiddleware)
+app.add_middleware(MetricsMiddleware)
 
 logger = logging.getLogger(__name__)