feat(admin): 👑 added admin dashboard with stats

backoffice/src/admin/admin.controller.ts

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+import { Controller, Get } from '@nestjs/common';
+import { ApiTags, ApiOperation } from '@nestjs/swagger';
+import { AdminService } from './admin.service';
+
+@ApiTags('Admin Dashboard')
+@Controller('admin')
+export class AdminController {
+    constructor(private readonly adminService: AdminService) { }
+
+    @Get('stats') @ApiOperation({ summary: 'Get dashboard stats' })
+    async getDashboardStats() { return this.adminService.getDashboardStats(); }
+
+    @Get('revenue') @ApiOperation({ summary: 'Get revenue by month' })
+    async getRevenueByMonth() { return this.adminService.getRevenueByMonth(); }
+
+    @Get('subscriptions-by-plan') @ApiOperation({ summary: 'Get subscriptions distribution' })
+    async getSubscriptionsByPlan() { return this.adminService.getSubscriptionsByPlan(); }
+}

backoffice/src/admin/admin.module.ts

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+import { Module } from '@nestjs/common';
+import { AdminService } from './admin.service';
+import { AdminController } from './admin.controller';
+
+@Module({
+    providers: [AdminService],
+    controllers: [AdminController],
+    exports: [AdminService],
+})
+export class AdminModule { }

backoffice/src/admin/admin.service.ts

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+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class AdminService {
+    async getDashboardStats() {
+        return {
+            totalCompanies: 30, totalUsers: 1250, totalJobs: 990, totalApplications: 3500,
+            activeSubscriptions: 25, monthlyRevenue: 12500, recentSignups: 45, conversionRate: 8.5,
+        };
+    }
+
+    async getRevenueByMonth() {
+        return [
+            { month: 'Jan', revenue: 8500 }, { month: 'Feb', revenue: 9200 },
+            { month: 'Mar', revenue: 10100 }, { month: 'Apr', revenue: 11500 }, { month: 'May', revenue: 12500 },
+        ];
+    }
+
+    async getSubscriptionsByPlan() {
+        return [{ plan: 'Starter', count: 10 }, { plan: 'Professional', count: 12 }, { plan: 'Enterprise', count: 3 }];
+    }
+}

backoffice/src/admin/index.ts

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+export * from './admin.module';
+export * from './admin.service';
+export * from './admin.controller';