feat: complete admin backend controllers and services

- AdminPlansController & Service (CRUD, reorder)
- AdminPaymentMethodsController & Service (CRUD, reorder)
- AdminPaymentsController & Service (verify, reject, pending count)
- AdminUsersController & Service (search, suspend, grant pro access, stats)
- AdminConfigController & Service (dynamic config management)
- Wire all controllers into AdminModule
- Import AdminModule in AppModule

Admin API Routes:
- GET/POST/PUT/DELETE /admin/plans
- GET/POST/PUT/DELETE /admin/payment-methods
- GET /admin/payments (with status filter)
- POST /admin/payments/:id/verify
- POST /admin/payments/:id/reject
- GET /admin/users (with search)
- POST /admin/users/:id/grant-pro
- GET/POST/DELETE /admin/config

All routes protected by AuthGuard + AdminGuard

apps/api/dist/admin/admin-plans.service.js

@@ -1,3 +1,71 @@
 "use strict";
+var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
+    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
+    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
+    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
+    return c > 3 && r && Object.defineProperty(target, key, r), r;
+};
+var __metadata = (this && this.__metadata) || function (k, v) {
+    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
+};
 Object.defineProperty(exports, "__esModule", { value: true });
+exports.AdminPlansService = void 0;
+const common_1 = require("@nestjs/common");
+const prisma_service_1 = require("../prisma/prisma.service");
+let AdminPlansService = class AdminPlansService {
+    prisma;
+    constructor(prisma) {
+        this.prisma = prisma;
+    }
+    async findAll() {
+        return this.prisma.plan.findMany({
+            orderBy: { sortOrder: 'asc' },
+            include: {
+                _count: {
+                    select: { subscriptions: true },
+                },
+            },
+        });
+    }
+    async findOne(id) {
+        return this.prisma.plan.findUnique({
+            where: { id },
+            include: {
+                _count: {
+                    select: { subscriptions: true },
+                },
+            },
+        });
+    }
+    async create(data) {
+        return this.prisma.plan.create({
+            data,
+        });
+    }
+    async update(id, data) {
+        return this.prisma.plan.update({
+            where: { id },
+            data,
+        });
+    }
+    async delete(id) {
+        return this.prisma.plan.update({
+            where: { id },
+            data: { isActive: false, isVisible: false },
+        });
+    }
+    async reorder(planIds) {
+        const updates = planIds.map((id, index) => this.prisma.plan.update({
+            where: { id },
+            data: { sortOrder: index + 1 },
+        }));
+        await this.prisma.$transaction(updates);
+        return { success: true };
+    }
+};
+exports.AdminPlansService = AdminPlansService;
+exports.AdminPlansService = AdminPlansService = __decorate([
+    (0, common_1.Injectable)(),
+    __metadata("design:paramtypes", [prisma_service_1.PrismaService])
+], AdminPlansService);
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