feat: Implement currency management with models, routes, and UI updates; add backfill script for existing records

docs/architecture.md

@@ -12,7 +12,7 @@ The backend leverages SQLAlchemy for ORM mapping to a PostgreSQL database.
 
 - **FastAPI backend** (`main.py`, `routes/`): hosts REST endpoints for scenarios, parameters, costs, consumption, production, equipment, maintenance, simulations, and reporting. Each router encapsulates request/response schemas and DB access patterns, leveraging a shared dependency module (`routes/dependencies.get_db`) for SQLAlchemy session management.
 - **Service layer** (`services/`): houses business logic. `services/reporting.py` produces statistical summaries, while `services/simulation.py` provides the Monte Carlo integration point.
-- **Persistence** (`models/`, `config/database.py`): SQLAlchemy models map to PostgreSQL tables in schema `bricsium_platform`. Relationships connect scenarios to derived domain entities.
+- **Persistence** (`models/`, `config/database.py`): SQLAlchemy models map to PostgreSQL tables. Relationships connect scenarios to derived domain entities.
 - **Presentation** (`templates/`, `components/`): server-rendered views extend a shared `base.html` layout with a persistent left sidebar, pull global styles from `static/css/main.css`, and surface data entry (scenario and parameter forms) alongside the Chart.js-powered dashboard.
   - **Reusable partials** (`templates/partials/components.html`): macro library that standardises select inputs, feedback/empty states, and table wrappers so pages remain consistent while keeping DOM hooks stable for existing JavaScript modules.
 - **Middleware** (`middleware/validation.py`): applies JSON validation before requests reach routers.