docs: remove deprecated Server mode and sync wiki with code - Remove Server-Deployment pages (Server mode is deprecated) - Core Proxy Modes: 5 modes per code (Transparent, MITM, QUIC, TLS-RF, Migration); add missing Migration mode, drop Server/WARP (WARP is not a GUI mode; usque.exe is never launched by the app) - Auto Routing: only the Default preset exists in code; remove WARP/Server fallback sections; GFWList is a local cache with no update UI - Fix mode tables in Usage Guide, FAQ suggestions, GUI mode lists and Sidebars
docs: add Usage Guide, CLI Reference and Code Structure pages (zh/en)