fix: QA audit — lint cleanup, i18n fixes, module visibility, sidebar UX

- Fix 97 lint errors → 0 (unused imports, params, variables across 40+ files)
- Fix i18n key format: colon → dot notation for next-intl compatibility
- Add missing i18n keys (routes.application, routes.home, confirm)
- Fix module visibility: sidebar now respects per-account DB features
- Fix inject function: use dot-notation keys, add collapsed:true defaults
- Fix ConfirmDialog: use useTranslations instead of hardcoded German defaults
- Fix events page: replace placeholder 'Beschreibung' with proper description
- Fix Dockerfile: add NEXT_PUBLIC_CI ARG for Docker builds
- Collapse secondary sidebar sections by default for cleaner UX

packages/features/admin/src/server/services/legacy-migration.service.ts

@@ -171,7 +171,7 @@ async function migrateAccounts(
 
   onProgress?.('Creating team accounts', Object.keys(TENANT_MAPPING).length);
 
-  for (const [profileId, config] of Object.entries(TENANT_MAPPING)) {
+  for (const [profileId, _config] of Object.entries(TENANT_MAPPING)) {
     try {
       // Create account_settings entry for each tenant
       result.count++;