fix(07-01): add filter to set redirect URL in registration form response

- Added set_registration_redirect() filter on frm_json_response
- Modifies Formidable's JSON response to include redirect_url
- Formidable JavaScript will then redirect to /anbieter-dashboard/
- Fixes registration redirect issue

includes/class-formidable.php

@@ -162,6 +162,9 @@ class DDHH_JM_Formidable {
 		// Hook into Formidable form submission
 		add_action( 'frm_after_create_entry', array( __CLASS__, 'handle_registration_submission' ), 30, 2 );
 
+		// Add filter to set redirect URL in form response
+		add_filter( 'frm_json_response', array( __CLASS__, 'set_registration_redirect' ), 10, 1 );
+
 		// Hook into Formidable form validation for ownership check
 		add_filter( 'frm_validate_entry', array( __CLASS__, 'validate_job_ownership' ), 10, 2 );
 		add_filter( 'frm_validate_entry', array( __CLASS__, 'validate_job_deactivation_ownership' ), 10, 2 );
@@ -262,6 +265,36 @@ class DDHH_JM_Formidable {
 		}
 	}
 
+	/**
+	 * Set redirect URL in form response for registration form
+	 *
+	 * @param array $response JSON response from form submission.
+	 * @return array Modified response.
+	 */
+	public static function set_registration_redirect( $response ) {
+		// Only modify response if there's a form_id in the response
+		if ( ! isset( $response['form_id'] ) ) {
+			return $response;
+		}
+
+		// Check if this is the registration form
+		if ( $response['form_id'] != self::get_registration_form_id() ) {
+			return $response;
+		}
+
+		// Only redirect if the submission was successful (no errors)
+		if ( ! empty( $response['errors'] ) ) {
+			return $response;
+		}
+
+		error_log('DDHH Registration: Setting redirect in form response');
+
+		// Set redirect URL
+		$response['redirect_url'] = home_url( '/anbieter-dashboard/' );
+
+		return $response;
+	}
+
 	/**
 	 * Handle registration form submission
 	 *