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>

frontend/src/api.ts

@@ -38,6 +38,8 @@ export interface Account {
   currency: string;
   label: string;
   balance: number;
+  account_type: string;
+  next_payment: number | null;
   updated_at: string;
 }
 
@@ -48,6 +50,12 @@ export interface Category {
   auto_match_patterns: string | null;
 }
 
+export interface ImportResult {
+  imported: number;
+  duplicates: number;
+  errors: string[];
+}
+
 export interface Transaction {
   id: number;
   amount: number;