feat: system settings, dynamic logos, template numbering, permission consolidation

- System settings page with tabs: Security, System, Firma
- Configurable attendance rules (break thresholds, rounding) from DB
- Configurable document numbering with template patterns ({YYYY}/{PREFIX}/{NNN})
- Dynamic logo upload (light/dark variants) served from DB instead of static files
- Email settings (SMTP from/name, alert/leave emails) configurable in UI
- Currency and VAT rate lists configurable, used across all modules
- Permissions simplified: offers.settings + settings.roles + settings.security → settings.manage
- Leaflet bundled locally, removed unpkg.com from CSP
- Silent catch blocks fixed with proper logging
- console.log replaced with app.log.info in server.ts
- Schema renamed: company-settings.schema → settings.schema
- App info section: version, Node.js, uptime, memory, DB status, NAS status

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

src/services/invoice-alerts.ts

@@ -2,6 +2,7 @@ import prisma from "../config/database";
 import { config } from "../config/env";
 import { sendMail } from "./mailer";
 import { localDateCzStr, localDateStr } from "../utils/date";
+import { getSystemSettings } from "./system-settings";
 
 interface AlertInvoice {
   id: number;
@@ -31,7 +32,8 @@ function formatAmount(n: number | { toNumber?: () => number }): string {
 }
 
 export async function checkInvoiceAlerts(): Promise<void> {
-  const alertEmail = config.email.invoiceAlert;
+  const settings = await getSystemSettings();
+  const alertEmail = settings.invoice_alert_email || config.email.invoiceAlert;
   if (!alertEmail) return;
 
   const today = new Date();