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.

models/__init__.py

@@ -28,6 +28,7 @@ from .scenario import Scenario
 from .simulation_parameter import SimulationParameter
 from .user import Role, User, UserRole, password_context
 from .profitability_snapshot import ProjectProfitability, ScenarioProfitability
+from .capex_snapshot import ProjectCapexSnapshot, ScenarioCapexSnapshot
 
 __all__ = [
     "FinancialCategory",
@@ -35,11 +36,13 @@ __all__ = [
     "MiningOperationType",
     "Project",
     "ProjectProfitability",
+    "ProjectCapexSnapshot",
     "PricingSettings",
     "PricingMetalSettings",
     "PricingImpuritySettings",
     "Scenario",
     "ScenarioProfitability",
+    "ScenarioCapexSnapshot",
     "ScenarioStatus",
     "DistributionType",
     "SimulationParameter",