fix: Resolve getJSON method error in student national ID verification and enhance curriculum worker Gemini model handling

backend/app/Controllers/AuthController.php

@@ -462,7 +462,7 @@ class AuthController
      */
     public function verifyNationalId(Request $request, Response $response): void
     {
-        $body = $request->getJSON();
+        $body = $request->getBody();
         $identityToken = $body['identity_token'] ?? '';
         $nationalId = trim((string)($body['national_id'] ?? ''));
 
@@ -606,13 +606,19 @@ class AuthController
         } else {
             // Legacy / Fallback for already logged-in students updating profile
             $studentId = (int)$request->user_id;
+            if (!$studentId) {
+                $authHeader = $request->getHeader('authorization', '');
+                if ($authHeader && preg_match('/Bearer\s(\S+)/i', $authHeader, $matches)) {
+                    $payload = Security::verifyJWT($matches[1]);
+                    if ($payload && isset($payload['user_id'])) {
+                        $studentId = (int)$payload['user_id'];
+                    }
+                }
+            }
             if (!$studentId) {
                 $response->status(401)->json(['status' => 'error', 'message' => 'غير مصرح']);
                 return;
             }
-            Database::query(
-                "UPDATE students SET full_name = ?, grade_level = ?, stream = ?, national_id = IF(? != '', ?, national_id), updated_at = NOW() WHERE id = ?",
-                [$fullName, $gradeLevel, $stream, $nationalId, $nationalId, $studentId]
             );
             $student = Database::selectOne("SELECT * FROM students WHERE id = ? LIMIT 1", [$studentId]);