Fix Degewo auto-apply (Wohnungshelden iframe), update dependencies, cleanup for production

- Fix Degewo handler to work with Wohnungshelden iframe portal
- Update playwright to >=1.57.0
- Add proper form field selectors for Wohnungshelden
- Fix success status bug (was marking failed submissions as success)
- Clean up .env.example (remove real credentials)
- Update README with housing company support table
- Add BOTFATHER_COMMANDS.txt for easy bot setup
- Add copilot-instructions.md for development context

.gitignore

@@ -4,10 +4,12 @@ __pycache__/
 *.class
 *.so
 .Python
+.venv
 .venv/
 venv/
 ENV/
 env/
+.python-version
 
 # Data
 data/
@@ -24,3 +26,8 @@ data/
 # OS
 .DS_Store
 Thumbs.db
+
+# Debug files (these should be in data/ but just in case)
+debug_page.html
+*.html
+!README.md