refactor: rename docker-compose.development.yml to docker-compose.dev.yml

- Rename to shorter docker-compose.dev.yml
- Add docker-compose.override.yml to .gitignore for local customizations
- Document override file pattern for device path customization
- Update README and CLAUDE.md with new naming convention

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

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

.gitignore

@@ -17,6 +17,9 @@ build/
 .env
 meshcore.conf
 
+# Docker local overrides
+docker-compose.override.yml
+
 # Data directories (keep structure, ignore content)
 data/snapshots/companion/**/*.json
 data/snapshots/repeater/**/*.json