refactor: migrate API scripts to a centralized directory and implement shared database configuration

api/delete_place.php

@@ -1,5 +1,6 @@
 <?php
-$conn = new mysqli("localhost", "root", "", "gis_project");
+require_once __DIR__ . '/config.php';
+$conn = getDB();
 
 $id = $_POST['id'];
 

api/get_places.php

@@ -1,6 +1,7 @@
 <?php
 header('Content-Type: application/json');
-$conn = new mysqli("localhost", "root", "", "gis_project");
+require_once __DIR__ . '/config.php';
+$conn = getDB();
 
 $result = $conn->query("SELECT * FROM worship_places");
 $places = [];

api/save_place.php

@@ -1,6 +1,7 @@
 <?php
 header('Content-Type: application/json');
-$conn = new mysqli("localhost", "root", "", "gis_project");
+require_once __DIR__ . '/config.php';
+$conn = getDB();
 
 $name    = $_POST['name'];
 $lat     = $_POST['lat'];

api/update_radius.php

@@ -1,5 +1,7 @@
 <?php
-$conn = new mysqli("localhost", "root", "", "gis_project");
+require_once __DIR__ . '/config.php';
+$conn = getDB();
+
 $id = $_POST['id'];
 $rad = $_POST['radius'];