The extracted headless crate is consumed by BOTH op-host-desktop (the GUI binary, for its
embedded --serve-web/MCP/chat/export) AND op-host-web-server — so 'web-daemon' was misleading.
Renamed crate dir + package + lib (op_web_daemon -> op_host_services) across all consumer files
(114 refs in 24 files) + the 4 Cargo.toml deps + Dockerfile/guard comments; identity docs
rewritten (it's the GUI-free host backend — daemon/MCP/AI/export/persistence — not web-specific).
No behavior change. (Lock renamed accordingly; the concurrent actor's op-host-web serde line excluded.)
