revert(cistech-tunnel): restore to working state at 5d54ed6

- Removed build/ folder
- Restored source/ folder with original Dockerfile and entrypoint.sh
- Reverted config files to original working state
- Cleaned up shared/ to only contain host routing scripts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/cistech-tunnel/build/.gitignore

@@ -1,2 +0,0 @@
-# Large binary files - track tar.gz but not 7z
-*.7z