feat(admin): SmartAdmin template redesign + security hardening

- Migrated all admin views from inline JS string templates to EJS
- Integrated SmartAdmin template with dark sidebar, fixed header, CSS grid
- Added express-ejs-layouts for master layout wrapper
- Security:
  - CSRF protection (double-submit cookie)
  - Rate limiting on /login (5/15min)
  - Token revocation via jti + globalLogoutTimestamp
  - Re-auth (reauth_token) for destructive endpoints
  - Settings whitelist (ALLOWED_KEYS) + removed process.exit
  - Seed phrases no longer rendered in HTML (CSV export only)
  - Multer fileFilter for image uploads + safe filename generation
  - SQL injection fix (currency column allowlist)
  - Global error handler + asyncHandler wrapper
- New files: csrf.js, errorHandler.js, error.ejs, all EJS templates
- SmartAdmin assets: CSS, icons, webfonts, plugins, scripts

package-lock.json

@@ -18,8 +18,10 @@
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         "dotenv": "^16.3.1",
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         "multer": "^2.2.0",
         "node-telegram-bot-api": "^0.64.0",
@@ -28,7 +30,8 @@
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@@ -2005,6 +2020,11 @@
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