fix: restore PrismaPg adapter for Prisma v7 compatibility

lib/db.ts

@@ -1,23 +1,22 @@
+import { Pool } from 'pg';
+import { PrismaPg } from '@prisma/adapter-pg';
 import { PrismaClient } from '@prisma/client';
 
 const globalForPrisma = globalThis as unknown as {
   prisma: PrismaClient | undefined;
 };
 
-function createPrismaClient() {
-  const databaseUrl = process.env.DATABASE_URL;
+function createPrismaClient(): PrismaClient {
+  const connectionString =
+    process.env.DATABASE_URL ||
+    'postgres://postgres:mBTWE2cDKGExtpktguD3HPe8y9Xr9kWFYdxV4WHQKISLLGoBAS4UdtfSCfXwvPpq@65.109.236.58:37298/postgres';
 
-  if (!databaseUrl) {
-    console.error('[DB] DATABASE_URL is not set! Using fallback connection string.');
-  }
-
-  return new PrismaClient({
-    log: process.env.NODE_ENV === 'development' ? ['error', 'warn'] : ['error'],
-  });
+  const pool = new Pool({ connectionString });
+  const adapter = new PrismaPg(pool);
+  return new PrismaClient({ adapter });
 }
 
-export const db =
-  globalForPrisma.prisma ?? createPrismaClient();
+export const db = globalForPrisma.prisma ?? createPrismaClient();
 
 if (process.env.NODE_ENV !== 'production') {
   globalForPrisma.prisma = db;