feat: implement centralized database configuration using .env file and custom loader

env_loader.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * Loader .env sederhana (tanpa dependency external)
+ * Membaca file .env dari root project dan mengisi $_ENV / getenv()
+ *
+ * Cara pakai:
+ *   require_once __DIR__ . '/env_loader.php';
+ *   $val = env('DB_HOST', 'localhost');
+ */
+
+function loadEnv(string $path): void {
+    if (!file_exists($path)) {
+        return; // File .env tidak ada, gunakan nilai default
+    }
+
+    $lines = file($path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+    foreach ($lines as $line) {
+        // Skip komentar
+        $line = trim($line);
+        if ($line === '' || str_starts_with($line, '#')) {
+            continue;
+        }
+
+        // Pisahkan KEY=VALUE (hanya split di tanda = pertama)
+        $eqPos = strpos($line, '=');
+        if ($eqPos === false) continue;
+
+        $key   = trim(substr($line, 0, $eqPos));
+        $value = trim(substr($line, $eqPos + 1));
+
+        // Hapus kutip jika ada ("value" atau 'value')
+        if (
+            (str_starts_with($value, '"') && str_ends_with($value, '"')) ||
+            (str_starts_with($value, "'") && str_ends_with($value, "'"))
+        ) {
+            $value = substr($value, 1, -1);
+        }
+
+        // Set ke $_ENV dan putenv agar bisa diakses lewat getenv()
+        if (!array_key_exists($key, $_ENV)) {
+            $_ENV[$key]  = $value;
+            putenv("$key=$value");
+        }
+    }
+}
+
+/**
+ * Helper: ambil nilai env dengan fallback default
+ */
+function env(string $key, mixed $default = null): mixed {
+    return $_ENV[$key] ?? getenv($key) ?: $default;
+}
+
+// Auto-load .env dari root webgis/ (dua level di atas subfolder, satu level di atas subfolder ini)
+loadEnv(__DIR__ . DIRECTORY_SEPARATOR . '.env');