feat: implement admin panel functionality in Mini App

- Added new API endpoints for admin features: `GET /api/admin/me`, `GET /api/admin/users`, and `PATCH /api/admin/duties/:id` to manage user duties.
- Introduced `UserForAdmin` and `AdminDutyReassignBody` schemas for handling admin-related data.
- Updated documentation to include Mini App design guidelines and admin panel functionalities.
- Enhanced tests for admin API to ensure proper access control and functionality.
- Improved error handling and localization for admin actions.

webapp-next/src/store/app-store.ts

@@ -30,6 +30,8 @@ export interface AppState {
   selectedDay: string | null;
   /** True when the first visible screen has finished loading; used to hide content until ready(). */
   appContentReady: boolean;
+  /** True when GET /api/admin/me returned is_admin: true; used to show Admin link. */
+  isAdmin: boolean;
 
   setCurrentMonth: (d: Date) => void;
   nextMonth: () => void;
@@ -44,8 +46,9 @@ export interface AppState {
   setCurrentView: (v: CurrentView) => void;
   setSelectedDay: (key: string | null) => void;
   setAppContentReady: (v: boolean) => void;
+  setIsAdmin: (v: boolean) => void;
   /** Batch multiple state updates into a single re-render. */
-  batchUpdate: (partial: Partial<Pick<AppState, "currentMonth" | "pendingMonth" | "lang" | "duties" | "calendarEvents" | "dataForMonthKey" | "loading" | "error" | "accessDenied" | "accessDeniedDetail" | "currentView" | "selectedDay" | "appContentReady">>) => void;
+  batchUpdate: (partial: Partial<Pick<AppState, "currentMonth" | "pendingMonth" | "lang" | "duties" | "calendarEvents" | "dataForMonthKey" | "loading" | "error" | "accessDenied" | "accessDeniedDetail" | "currentView" | "selectedDay" | "appContentReady" | "isAdmin">>) => void;
 }
 
 const now = new Date();
@@ -71,6 +74,7 @@ export const useAppStore = create<AppState>((set) => ({
   currentView: getInitialView(),
   selectedDay: null,
   appContentReady: false,
+  isAdmin: false,
 
   setCurrentMonth: (d) => set({ currentMonth: d }),
   nextMonth: () =>
@@ -91,5 +95,6 @@ export const useAppStore = create<AppState>((set) => ({
   setCurrentView: (v) => set({ currentView: v }),
   setSelectedDay: (key) => set({ selectedDay: key }),
   setAppContentReady: (v) => set({ appContentReady: v }),
+  setIsAdmin: (v) => set({ isAdmin: v }),
   batchUpdate: (partial) => set(partial),
 }));