chore: switch database provider from SQLite to PostgreSQL

prisma/migrations/migration_lock.toml

@@ -1,3 +1,3 @@
 # Please do not edit this file manually
 # It should be added in your version-control system (e.g., Git)
-provider = "sqlite"
+provider = "postgresql"

scripts/setup-postgres.js

@@ -9,6 +9,12 @@ const { execSync } = require('child_process');
 const fs = require('fs');
 const path = require('path');
 
+// Load .env file if it exists
+const envPath = path.resolve(__dirname, '..', '.env');
+if (fs.existsSync(envPath)) {
+  require('dotenv').config({ path: envPath });
+}
+
 function checkPostgresConnection() {
   try {
     const dbUrl = process.env.DATABASE_URL;