feat: Implement initial capex calculation feature

- Added CapexComponentInput, CapexParameters, CapexCalculationRequest, CapexCalculationResult, and related schemas for capex calculations.
- Introduced calculate_initial_capex function to aggregate capex components and compute totals and timelines.
- Created ProjectCapexRepository and ScenarioCapexRepository for managing capex snapshots in the database.
- Developed capex.html template for capturing and displaying initial capex data.
- Registered common Jinja2 filters for formatting currency and percentages.
- Implemented unit and integration tests for capex calculation functionality.
- Updated unit of work to include new repositories for capex management.

tests/conftest.py

@@ -17,6 +17,7 @@ from dependencies import get_auth_session, get_import_ingestion_service, get_uni
 from models import User
 from routes.auth import router as auth_router
 from routes.dashboard import router as dashboard_router
+from routes.calculations import router as calculations_router
 from routes.projects import router as projects_router
 from routes.scenarios import router as scenarios_router
 from routes.imports import router as imports_router
@@ -57,6 +58,7 @@ def app(session_factory: sessionmaker) -> FastAPI:
     application = FastAPI()
     application.include_router(auth_router)
     application.include_router(dashboard_router)
+    application.include_router(calculations_router)
     application.include_router(projects_router)
     application.include_router(scenarios_router)
     application.include_router(imports_router)