Update .gitignore to use bin/ directory for builds

- Changed from ignoring 'litestream' binary in root to ignoring 'bin/' directory
- All builds should now use ./bin/litestream as output path
- This prevents accidentally committing binaries in the root directory

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: corylanou

.gitignore

@@ -7,4 +7,4 @@
 CLAUDE.md
 
 # Binary
-litestream
+bin/