feat: 落地打赏(个人码捐赠)模式并将付费面改为免费+赞助(无ICP证合规)

- 新增 Donation 模型/迁移/后端 API(GET,POST /donations)
- 新增前端 /donate 页:收款码+感谢留言+感谢墙
- 会员页/技能广场/用量包 下架付费,改免费开放+赞助入口
- 沙箱用量耗尽引导至 /donate 赞助
- 导航与页脚新增 赞助/联盟返佣 入口,补充 i18n

backend/src/app.module.ts

@@ -25,6 +25,7 @@ import { LearningModule } from './modules/learning/learning.module';
 import { SkillsModule } from './modules/skills/skills.module';
 import { AiAssistantModule } from './modules/ai-assistant/ai-assistant.module';
 import { PracticesModule } from './modules/practices/practices.module';
+import { DonationsModule } from './modules/donations/donations.module';
 import { RedisThrottlerStorage } from './common/redis-throttler-storage';
 
 @Module({
@@ -45,6 +46,7 @@ import { RedisThrottlerStorage } from './common/redis-throttler-storage';
     EnterpriseModule, NotificationModule, LearningModule, SkillsModule,
     AiAssistantModule,
     PracticesModule,
+    DonationsModule,
   ],
   providers: [
     { provide: APP_GUARD, useClass: ThrottlerGuard },

backend/src/modules/donations/donations.controller.ts

@@ -0,0 +1,20 @@
+import { Controller, Get, Post, Body, Query, HttpCode } from '@nestjs/common';
+import { DonationsService } from './donations.service';
+import { CreateDonationDto } from './dto/create-donation.dto';
+
+@Controller('donations')
+export class DonationsController {
+  constructor(private readonly donationsService: DonationsService) {}
+
+  @Get()
+  getList(@Query('limit') limit?: string) {
+    const parsed = limit ? Math.min(parseInt(limit, 10) || 20, 50) : 20;
+    return this.donationsService.getList(parsed);
+  }
+
+  @Post()
+  @HttpCode(200)
+  create(@Body() dto: CreateDonationDto) {
+    return this.donationsService.create(dto);
+  }
+}

backend/src/modules/donations/donations.module.ts

@@ -0,0 +1,12 @@
+import { Module } from '@nestjs/common';
+import { DonationsService } from './donations.service';
+import { DonationsController } from './donations.controller';
+import { PrismaModule } from '../../prisma/prisma.module';
+
+@Module({
+  imports: [PrismaModule],
+  controllers: [DonationsController],
+  providers: [DonationsService],
+  exports: [DonationsService],
+})
+export class DonationsModule {}

backend/src/modules/donations/donations.service.ts

@@ -0,0 +1,51 @@
+import { Injectable } from '@nestjs/common';
+import { PrismaService } from '../../prisma/prisma.service';
+
+@Injectable()
+export class DonationsService {
+  constructor(private prisma: PrismaService) {}
+
+  async getList(limit = 20) {
+    const donations = await this.prisma.donation.findMany({
+      orderBy: { createdAt: 'desc' },
+      take: limit,
+      select: {
+        id: true,
+        name: true,
+        message: true,
+        channel: true,
+        amount: true,
+        createdAt: true,
+      },
+    });
+    return {
+      donations: donations.map((d) => ({
+        ...d,
+        amount: d.amount != null ? Number(d.amount) : null,
+      })),
+    };
+  }
+
+  async create(data: {
+    name?: string;
+    message?: string;
+    channel?: 'ALIPAY' | 'WECHAT';
+    amount?: number;
+  }) {
+    const donation = await this.prisma.donation.create({
+      data: {
+        name: data.name ?? null,
+        message: data.message ?? null,
+        channel: data.channel ?? 'ALIPAY',
+        amount: data.amount != null ? data.amount : null,
+      },
+    });
+    return {
+      success: true,
+      donation: {
+        ...donation,
+        amount: donation.amount != null ? Number(donation.amount) : null,
+      },
+    };
+  }
+}

backend/src/modules/donations/dto/create-donation.dto.ts

@@ -0,0 +1,22 @@
+import { IsOptional, IsString, IsIn, IsNumber, MaxLength, Min } from 'class-validator';
+
+export class CreateDonationDto {
+  @IsOptional()
+  @IsString()
+  @MaxLength(40)
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(280)
+  message?: string;
+
+  @IsOptional()
+  @IsIn(['ALIPAY', 'WECHAT'])
+  channel?: 'ALIPAY' | 'WECHAT';
+
+  @IsOptional()
+  @IsNumber({ allowNaN: false, allowInfinity: false })
+  @Min(0)
+  amount?: number;
+}