feat(backend): Day 5 - backend basic architecture setup completed

backend/src/config/database.ts

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+import { PrismaClient } from '@prisma/client';
+
+// 创建Prisma Client实例
+export const prisma = new PrismaClient({
+  log: process.env.NODE_ENV === 'development' ? ['query', 'info', 'warn', 'error'] : ['error'],
+});
+
+// 数据库连接测试
+export async function testDatabaseConnection(): Promise<boolean> {
+  try {
+    await prisma.$connect();
+    console.log('✅ 数据库连接成功！');
+    
+    // 获取数据库信息
+    const result = await prisma.$queryRaw<Array<{ version: string }>>`SELECT version()`;
+    console.log('📊 数据库版本:', result[0]?.version.split(' ')[0], result[0]?.version.split(' ')[1]);
+    
+    return true;
+  } catch (error) {
+    console.error('❌ 数据库连接失败:', error);
+    return false;
+  }
+}
+
+// 优雅关闭数据库连接
+export async function closeDatabaseConnection() {
+  await prisma.$disconnect();
+  console.log('👋 数据库连接已关闭');
+}
+
+// 进程退出时关闭连接
+process.on('beforeExit', async () => {
+  await closeDatabaseConnection();
+});
+

backend/src/config/env.ts

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+import { config as dotenvConfig } from 'dotenv';
+
+dotenvConfig();
+
+export const config = {
+  // 服务器配置
+  nodeEnv: process.env.NODE_ENV || 'development',
+  port: parseInt(process.env.PORT || '3001', 10),
+  host: process.env.HOST || '0.0.0.0',
+
+  // 数据库配置
+  databaseUrl: process.env.DATABASE_URL || '',
+
+  // Redis配置
+  redisUrl: process.env.REDIS_URL || 'redis://localhost:6379',
+
+  // JWT配置
+  jwtSecret: process.env.JWT_SECRET || 'your-secret-key',
+
+  // 大模型API Keys
+  deepseekApiKey: process.env.DEEPSEEK_API_KEY || '',
+  qwenApiKey: process.env.QWEN_API_KEY || '',
+  geminiApiKey: process.env.GEMINI_API_KEY || '',
+
+  // Dify配置
+  difyApiUrl: process.env.DIFY_API_URL || 'http://localhost:5001',
+  difyApiKey: process.env.DIFY_API_KEY || '',
+
+  // 文件上传配置
+  uploadMaxSize: parseInt(process.env.UPLOAD_MAX_SIZE || '10485760', 10),
+  uploadDir: process.env.UPLOAD_DIR || './uploads',
+
+  // 日志配置
+  logLevel: process.env.LOG_LEVEL || 'info',
+};
+