- Rename customWriter struct to httpWriter for clarity
- Add closeWriter field to properly close write side of connections
- Update all cw variable references to hw
- Merge handlerTLS into handler function to reduce code duplication
- Extract handler into smaller, focused methods
- Split Read/Write/forwardRequest into composable functions
Fixes resource leak where connections weren't properly closed on the
write side, matching the forwarder's CloseWrite() pattern.
