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/booking-management/src/server/actions/booking-actions.ts

@@ -15,7 +15,7 @@ import { createBookingManagementApi } from '../api';
 
 export const createBooking = authActionClient
   .inputSchema(CreateBookingSchema)
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createBookingManagementApi(client);
@@ -33,7 +33,7 @@ export const updateBookingStatus = authActionClient
       status: z.string(),
     }),
   )
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createBookingManagementApi(client);
@@ -46,7 +46,7 @@ export const updateBookingStatus = authActionClient
 
 export const createRoom = authActionClient
   .inputSchema(CreateRoomSchema)
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createBookingManagementApi(client);
@@ -59,7 +59,7 @@ export const createRoom = authActionClient
 
 export const createGuest = authActionClient
   .inputSchema(CreateGuestSchema)
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createBookingManagementApi(client);

packages/features/booking-management/src/server/api.ts

@@ -7,7 +7,7 @@ import type { CreateBookingInput } from '../schema/booking.schema';
 /* eslint-disable @typescript-eslint/no-explicit-any */
 
 export function createBookingManagementApi(client: SupabaseClient<Database>) {
-  const db = client;
+  const _db = client;
 
   return {
     // --- Rooms ---