重构 API 为 8 领域 + 应用层架构

将后端模块拆分为 domains、applications、shared 三层，结算计算器移入 domain 纯函数目录，API 路径与测试保持不变。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/domains/operations/content/content.module.ts

@@ -0,0 +1,8 @@
+import { Module } from '@nestjs/common';
+import { ContentService } from './content.service';
+
+@Module({
+  providers: [ContentService],
+  exports: [ContentService],
+})
+export class ContentModule {}

apps/api/src/domains/operations/content/content.service.ts

@@ -0,0 +1,59 @@
+import { Injectable } from '@nestjs/common';
+import { PrismaService } from '../../../shared/prisma/prisma.service';
+
+@Injectable()
+export class ContentService {
+  constructor(private prisma: PrismaService) {}
+
+  async listActive(contentType: string, locale: string) {
+    const now = new Date();
+    const items = await this.prisma.content.findMany({
+      where: {
+        contentType,
+        status: 'ACTIVE',
+        OR: [{ startTime: null }, { startTime: { lte: now } }],
+        AND: [{ OR: [{ endTime: null }, { endTime: { gte: now } }] }],
+      },
+      include: { translations: true },
+      orderBy: { sortOrder: 'asc' },
+    });
+
+    return items.map((item) => {
+      const t =
+        item.translations.find((tr) => tr.locale === locale) ||
+        item.translations.find((tr) => tr.locale === 'en-US') ||
+        item.translations[0];
+      return { ...item, translation: t };
+    });
+  }
+
+  async create(data: {
+    contentType: string;
+    sortOrder?: number;
+    linkType?: string;
+    linkTarget?: string;
+    translations: Array<{ locale: string; title?: string; body?: string; imageUrl?: string }>;
+  }) {
+    return this.prisma.content.create({
+      data: {
+        contentType: data.contentType,
+        sortOrder: data.sortOrder ?? 0,
+        linkType: data.linkType,
+        linkTarget: data.linkTarget,
+        status: 'ACTIVE',
+        translations: {
+          create: data.translations,
+        },
+      },
+      include: { translations: true },
+    });
+  }
+
+  async listAll(contentType?: string) {
+    return this.prisma.content.findMany({
+      where: contentType ? { contentType } : {},
+      include: { translations: true },
+      orderBy: { sortOrder: 'asc' },
+    });
+  }
+}