feat: reorganize admin settings with tabbed interface and documentation

- Reorganized admin settings into tabbed interface (General, Security, Payment Methods)
- Vertical tabs on desktop, horizontal scrollable on mobile
- Moved Payment Methods from separate menu to Settings tab
- Fixed admin profile reuse and dashboard blocking
- Fixed maintenance mode guard to use AppConfig model
- Added admin auto-redirect after login (admins → /admin, users → /)
- Reorganized documentation into docs/ folder structure
- Created comprehensive README and documentation index
- Added PWA and Web Push notifications to to-do list

apps/api/src/users/users.controller.ts

@@ -1,4 +1,12 @@
-import { Controller, Get, Put, Delete, Body, Req, UseGuards } from '@nestjs/common';
+import {
+  Controller,
+  Get,
+  Put,
+  Delete,
+  Body,
+  Req,
+  UseGuards,
+} from '@nestjs/common';
 import { AuthGuard } from '../auth/auth.guard';
 import { UsersService } from './users.service';
 

apps/api/src/users/users.service.ts

@@ -1,4 +1,8 @@
-import { Injectable, BadRequestException, UnauthorizedException } from '@nestjs/common';
+import {
+  Injectable,
+  BadRequestException,
+  UnauthorizedException,
+} from '@nestjs/common';
 import { PrismaService } from '../prisma/prisma.service';
 import { getTempUserId } from '../common/user.util';
 import * as bcrypt from 'bcrypt';