Refactor: repo hygiene, shared utils, focused tests, and CI improvements

- Remove dead imports/duplication from Google2xls.py and social.py
- Centralize shared logic in review_workflow_utils.py
- Add focused posting-flow tests in tests/test_social.py (all pass)
- Update .gitignore for secrets and local artifacts
- Trim requirements.txt to direct deps
- Improve CI: compile all scripts, run focused tests
- Prep repo for clean commit (no secrets, no local artifacts)

.gitignore

@@ -1,24 +1,9 @@
-Driver/
-__pycache__/
-out.xlsx
-Output/
-env.py
-requirements.txt
-test.py
-ThreadsPost.py
-TikTokPost.py
-WP2xls.py
-Xpost.py
-Instapost.py
-InstaBot.py
-Google2xls.py
-google.py
-geckodriver.log
-Facepost.py
-config/
-env.py
-social.py
-.vscode/
-googleinfo.py
-social.examples.py
-debug.log
+Driver/
+__pycache__/
+out.xlsx
+Output/
+env.py
+geckodriver.log
+config/
+.vscode/
+debug.log