feat: 联盟返佣系统规范化并打通技能广场（无 ICP 证合规变现主路径）

- 新增 AffiliateProgram / AffiliateLink / AffiliateClick 规范化 Prisma 模型
  取代原手写裸表 affiliate_stats / affiliate_clicks
- 新增迁移 prisma/migrations/20260711000000_add_affiliate_models
- 重构 affiliate.service.ts 改用 Prisma ORM，消除 $queryRawUnsafe SQL 注入
- 重构 affiliate.controller.ts 接口：programs / links(?skillId,?toolId) / stats / click
- 前端 affiliate 页接入真实接口，移除硬编码 demo 数据
- 技能详情页新增「学此技能推荐使用的工具」联盟链接区块
- 新增 affiliate.service.spec.ts（4 用例通过）与幂等种子 seed-affiliate.ts
- 更新 docs/progress/current.md，明确无 ICP 经营许可证下以联盟返佣为合规变现主路径
- 含此前工作区未提交改动（工具 slug 路由、支付/订单、SEO 等）

Co-Authored-By: opencode <opencode@anthropic.com>

backend/src/modules/tools/tools.service.ts

@@ -1,17 +1,18 @@
-import { Injectable } from '@nestjs/common';
+import { Injectable, NotFoundException } from '@nestjs/common';
 import { PrismaService } from '../../prisma/prisma.service';
 
 @Injectable()
 export class ToolsService {
   constructor(private prisma: PrismaService) {}
 
-  async findAll(params: { page?: number; pageSize?: number; categoryId?: number; isFeatured?: boolean }) {
+  async findAll(params: { page?: number; pageSize?: number; categoryId?: number; isFeatured?: boolean; tag?: string }) {
     const page = Number(params.page ?? 1);
     const pageSize = Number(params.pageSize ?? 20);
-    const { categoryId, isFeatured } = params;
+    const { categoryId, isFeatured, tag } = params;
     const where: any = { status: 'PUBLISHED', deletedAt: null };
     if (categoryId) where.categoryId = categoryId;
     if (isFeatured !== undefined) where.isFeatured = isFeatured;
+    if (tag) where.tags = { contains: tag };
 
     const [items, total] = await Promise.all([
       this.prisma.tool.findMany({
@@ -27,7 +28,35 @@ export class ToolsService {
     return { items, total, page, pageSize };
   }
 
-  async create(data: { name: string; description?: string; url: string; icon?: string; affiliateLink?: string; categoryId?: number; tags?: string }) {
+  async findBySlug(slug: string) {
+    const tool = await this.prisma.tool.findUnique({
+      where: { slug },
+      include: { category: true },
+    });
+    if (!tool || tool.deletedAt) {
+      throw new NotFoundException('工具不存在');
+    }
+    // 增加浏览量
+    await this.prisma.tool.update({
+      where: { id: tool.id },
+      data: { viewCount: { increment: 1 } },
+    });
+    return tool;
+  }
+
+  async create(data: {
+    name: string;
+    slug: string;
+    description?: string;
+    url: string;
+    icon?: string;
+    affiliateLink?: string;
+    categoryId?: number;
+    tags?: string;
+    metaTitle?: string;
+    metaDesc?: string;
+    content?: string;
+  }) {
     return this.prisma.tool.create({ data });
   }
 }