v1.6.7: add settings.system permission, move numbering/VAT to company tab, rename security tab to roles

- New settings.system permission with migration (idempotent INSERT)
- requireAnyPermission helper for route guards accepting multiple perms
- Move document numbering + currency/VAT cards from system tab to CompanySettings
- Rename security tab to roles, add canManageSystem alongside canManageCompany
- TOTP required endpoint and system-info now use settings.system
- Roles list now includes user_count
- Sidebar Settings link includes settings.system

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/routes/admin/company-settings.ts

@@ -3,6 +3,7 @@ import prisma from "../../config/database";
 import {
   requireAuth,
   requirePermission,
+  requireAnyPermission,
   optionalAuth,
 } from "../../middleware/auth";
 import { logAudit } from "../../services/audit";
@@ -333,7 +334,7 @@ export default async function companySettingsRoutes(
   // GET /api/admin/company-settings/system-info
   fastify.get(
     "/system-info",
-    { preHandler: requirePermission("settings.company") },
+    { preHandler: requirePermission("settings.system") },
     async (request, reply) => {
       // eslint-disable-next-line @typescript-eslint/no-var-requires
       const pkg = require("../../../package.json") as { version: string };
@@ -404,7 +405,7 @@ export default async function companySettingsRoutes(
 
   fastify.put(
     "/",
-    { preHandler: requirePermission("settings.company") },
+    { preHandler: requireAnyPermission("settings.company", "settings.system") },
     async (request, reply) => {
       const parsed = parseBody(UpdateCompanySettingsSchema, request.body);
       if ("error" in parsed) return error(reply, parsed.error, 400);