FlashDuty MCP Server 0.8.0

improve logging and HTTP server configuration

- Add custom ordered text handler to ensure consistent field ordering (time, level, trace_id)
- Remove redundant HTTP request logging (handled by MCP hooks)
- Support local timezone in logs with TZ environment variable fallback
- Add TOON output format support for HTTP server mode
- Extract logging code to separate log.go file for better organization
- Update documentation for TZ environment variable

Full Changelog: v0.7.0...v0.8.0