fix(api-prisma): initialize prisma client with pg adapter

apps/api/src/prisma/prisma.service.ts

@@ -1,8 +1,23 @@
 import { Injectable, OnModuleDestroy, OnModuleInit } from "@nestjs/common";
+import { ConfigService } from "@nestjs/config";
+import { PrismaPg } from "@prisma/adapter-pg";
 import { PrismaClient } from "../../generated/prisma/client";
 
 @Injectable()
 export class PrismaService extends PrismaClient implements OnModuleInit, OnModuleDestroy {
+  constructor(configService: ConfigService) {
+    const connectionString = configService.get<string>("DATABASE_URL");
+    if (!connectionString) {
+      throw new Error("缺少数据库连接配置 DATABASE_URL");
+    }
+
+    super({
+      adapter: new PrismaPg({
+        connectionString
+      })
+    });
+  }
+
   async onModuleInit(): Promise<void> {
     await this.$connect();
   }