feat(navigation): Enhance navigation links and add legacy route redirects

- Updated navigation links in `init_db.py` to include href overrides and parent slugs for profitability, opex, and capex planners.
- Modified `NavigationService` to handle child links and href overrides, ensuring proper routing when context is missing.
- Adjusted scenario detail and list templates to use new route names for opex and capex forms, with legacy fallbacks.
- Introduced integration tests for legacy calculation routes to ensure proper redirection and error handling.
- Added tests for navigation sidebar to validate role-based access and link visibility.
- Enhanced navigation sidebar tests to include calculation links and contextual URLs based on project and scenario IDs.

changelog.md

@@ -2,6 +2,9 @@
 
 ## 2025-11-13
 
+- Refactored the architecture data model docs by turning `calminer-docs/architecture/08_concepts/02_data_model.md` into a concise overview that links to new detail pages covering SQLAlchemy models, navigation metadata, enumerations, Pydantic schemas, and monitoring tables.
+- Nested the calculator navigation under Projects by updating `scripts/init_db.py` seeds, teaching `services/navigation.py` to resolve scenario-scoped hrefs for profitability/opex/capex, and extending sidebar coverage through `tests/integration/test_navigation_sidebar_calculations.py` plus `tests/services/test_navigation_service.py` to validate admin/viewer visibility and contextual URL generation.
+- Added navigation sidebar integration coverage by extending `tests/conftest.py` with role-switching headers, seeding admin/viewer test users, and adding `tests/integration/test_navigation_sidebar.py` to assert ordered link rendering for admins, viewer filtering of admin-only entries, and anonymous rejection of the endpoint.
 - Finalised the financial data import/export templates by inventorying required fields, defining CSV column specs with validation rules, drafting Excel workbook layouts, documenting end-user workflows in `calminer-docs/userguide/data_import_export.md`, and recording stakeholder review steps alongside updated TODO/DONE tracking.
 - Scoped profitability calculator UI under the scenario hierarchy by adding `/calculations/projects/{project_id}/scenarios/{scenario_id}/profitability` GET/POST handlers, updating scenario templates and sidebar navigation to link to the new route, and extending `tests/test_project_scenario_routes.py` with coverage for the scenario path plus legacy redirect behaviour (module run: 14 passed).
 - Extended scenario frontend regression coverage by updating `tests/test_project_scenario_routes.py` to assert project/scenario breadcrumbs and calculator navigation, normalising escaped URLs, and re-running the module tests (13 passing).