feat: Add profitability calculation schemas and service functions

- Introduced Pydantic schemas for profitability calculations in `schemas/calculations.py`.
- Implemented service functions for profitability calculations in `services/calculations.py`.
- Added new exception class `ProfitabilityValidationError` for handling validation errors.
- Created repositories for managing project and scenario profitability snapshots.
- Developed a utility script for verifying authenticated routes.
- Added a new HTML template for the profitability calculator interface.
- Implemented a script to fix user ID sequence in the database.

main.py

@@ -10,6 +10,7 @@ from middleware.metrics import MetricsMiddleware
 from middleware.validation import validate_json
 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.imports import router as imports_router
 from routes.exports import router as exports_router
 from routes.projects import router as projects_router
@@ -40,7 +41,16 @@ async def health() -> dict[str, str]:
     return {"status": "ok"}
 
 
+@app.get("/favicon.ico", include_in_schema=False)
+async def favicon() -> Response:
+    static_directory = "static"
+    img_directory = f"{static_directory}/img"
+    favicon_img = "logo_32x32.png"
+    return StaticFiles(directory=img_directory).lookup_path(favicon_img)[0]
+
+
 @app.on_event("startup")
+# TODO: use lifespan events for startup/shutdown tasks
 async def ensure_admin_bootstrap() -> None:
     settings = get_settings()
     admin_settings = settings.admin_bootstrap_settings()
@@ -93,6 +103,7 @@ async def ensure_admin_bootstrap() -> None:
 
 
 app.include_router(dashboard_router)
+app.include_router(calculations_router)
 app.include_router(auth_router)
 app.include_router(imports_router)
 app.include_router(exports_router)