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/document-generator/src/server/api.ts

@@ -11,7 +11,7 @@ export function createDocumentGeneratorApi() {
      * Generate a PDF document (member card, invoice, certificate, etc.)
      * Uses @react-pdf/renderer or jspdf at runtime.
      */
-    async generatePdf(params: {
+    async generatePdf(_params: {
       title: string;
       content: Record<string, unknown>;
       format?: 'A4' | 'A5' | 'letter';
@@ -28,7 +28,7 @@ export function createDocumentGeneratorApi() {
      * Generate an Excel workbook (reports, data exports)
      * Uses exceljs at runtime.
      */
-    async generateExcel(params: {
+    async generateExcel(_params: {
       title: string;
       sheets: Array<{
         name: string;
@@ -45,7 +45,7 @@ export function createDocumentGeneratorApi() {
      * Generate a Word document (mail merge, letters)
      * Uses docx at runtime.
      */
-    async generateWord(params: {
+    async generateWord(_params: {
       title: string;
       templateContent: string;
       mergeFields: Record<string, string>;