feat: implement environment-based database connection utility and configuration management

api/db_connect.php

@@ -1,17 +1,26 @@
 <?php
-$host = "localhost";
-$user = "root";
-$pass = "";
-$db   = "webgis_poverty";
+// Load konfigurasi dari file .env
+require_once __DIR__ . '/env_loader.php';
 
-// Coba koneksi ke server dan pilih database
-$conn = new mysqli($host, $user, $pass, $db);
+$host = env('DB_HOST', 'localhost');
+$port = (int) env('DB_PORT', 3306);
+$user = env('DB_USER', 'root');
+$pass = env('DB_PASS', '');
+$db   = env('DB_NAME', 'webgis_poverty');
+
+// Koneksi ke MySQL/MariaDB
+$conn = new mysqli($host, $user, $pass, $db, $port);
 
 if ($conn->connect_error) {
-    die("Koneksi gagal: " . $conn->connect_error);
+    http_response_code(500);
+    die(json_encode([
+        'status'  => 'error',
+        'message' => 'Koneksi database gagal: ' . $conn->connect_error,
+    ]));
 }
+
 // Set charset
-$conn->set_charset("utf8mb4");
+$conn->set_charset('utf8mb4');
 
 // Jika di-include oleh file API, biarkan $conn tersedia
 ?>