fix(admin): verify CSRF token in village admin Mods [#139] (#259)

editVillageOwner, renameVillage, editBuildings and editResources are POSTed
to directly, bypassing admin.php's central csrf_verify(). Add csrf_verify()
(after the admin access check, via the shared GameEngine/Admin/csrf.php) and
csrf_field() in their forms (editVillage.tpl, village.tpl, editResources.tpl).

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

GameEngine/Admin/Mods/editResources.php

@@ -17,6 +17,11 @@ if (empty($_SESSION['access']) || $_SESSION['access'] < 9) {
     die("Access Denied: You are not Admin!");
 }
 
+// Issue #139: this Mod is POSTed to directly, so it must verify the CSRF token
+// itself (it does not go through admin.php's central csrf_verify()).
+require_once(__DIR__ . '/../csrf.php');
+csrf_verify();
+
 include_once("../../config.php");
 
 // ---------------------------------------------------------------------------