fix: pass chatbot attachments to Selenium claim worker and add missing re import

- Add `import re` to all Selenium workers that use re.search() for claim number extraction
- Pass uploadedFiles to onHandleForMHSeleniumClaim so attachments reach the MH website
- Save chatbot pending files in check-and-claim and batch-check-and-claim flows

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/SeleniumService/selenium_DDMA_eligibilityCheckWorker.py

@@ -8,6 +8,7 @@ from selenium.webdriver.support import expected_conditions as EC
 from webdriver_manager.chrome import ChromeDriverManager
 import time
 import os
+import re
 import base64
 
 from ddma_browser_manager import get_browser_manager