Add accounts expansion, analytics, exchange rates, API tokens, PWA support, and UI overhaul

- Expand Account model with account_type (pension, savings, liability, crypto), new banks/currencies (BTC, XMR, FCL, ROP, VOL, MEMP, MPAT, MORTGAGE), and next_payment field
- Add exchange rate endpoint (BCCR integration), analytics endpoint, paste-import for transactions, and API token management
- Add PWA manifest, service worker, and app icons
- Redesign dashboard, transactions, transfers, and login pages with theme support
- Add billing cycle selector, confirm dialog, and paste import modal components
- One-time DB reset in deploy workflow for schema migration

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/api/v1/router.py

@@ -1,9 +1,22 @@
 from fastapi import APIRouter
 
-from app.api.v1.endpoints import accounts, auth, categories, transactions
+from app.api.v1.endpoints import (
+    accounts,
+    analytics,
+    auth,
+    categories,
+    exchange_rate,
+    import_transactions,
+    tokens,
+    transactions,
+)
 
 api_router = APIRouter(prefix="/api/v1")
 api_router.include_router(auth.router)
 api_router.include_router(accounts.router)
 api_router.include_router(categories.router)
 api_router.include_router(transactions.router)
+api_router.include_router(import_transactions.router)
+api_router.include_router(exchange_rate.router)
+api_router.include_router(tokens.router)
+api_router.include_router(analytics.router)