feat(quick-001): redirect logged-in providers from login page to dashboard

- Add setup_hooks() method to DDHH_JM_Pages class
- Add maybe_redirect_logged_in_from_login() method that checks if current page is login page
- Redirect logged-in providers to dashboard, allow non-providers to view login page
- Register Pages::setup_hooks() in main plugin orchestrator

includes/class-ddhh-job-manager.php

@@ -84,5 +84,8 @@ class DDHH_JM_Job_Manager {
 
 		// Initialize scheduler for async email processing
 		add_action( 'init', array( 'DDHH_JM_Scheduler', 'setup_hooks' ) );
+
+		// Initialize pages
+		add_action( 'init', array( 'DDHH_JM_Pages', 'setup_hooks' ) );
 	}
 }