This is a Go-based video parsing tool that removes watermarks from videos across 20+ Chinese social media platforms (Douyin, Kuaishou, Bilibili, Weibo, etc.). It provides three interfaces: a CLI tool (using Cobra subcommands `serve`, `parse`, `id`, `version`), an HTTP API (Gin-based with v1 RESTful endpoints and legacy backward-compatible routes), and a reusable Go library. The architecture is a monolith with a clean separation: `parser/` package contains platform-specific parsers implementing strategy pattern interfaces, `cmd/` package handles CLI and HTTP server logic with a middleware stack (recovery, CORS, rate limiting, basic auth, logging), and `utils/` provides URL extraction. The system is stateless, uses no database, and relies on HTTP scraping and API calls to extract video metadata. Notable engineering craftsmanship includes a custom anti-crawling a_bogus signature generation for Douyin's native detail API (SM3 hash, RC4 encryption), a concurrent-safe proxy injection via atomic.Value, and a well-tested middleware stack with IP-based rate limiting using sync.Map and periodic cleanup. The codebase has comprehensive unit and integration tests, CI/CD pipelines, and Docker support.