* feat(terminal): add resumable websocket transport
Unify terminal input and stream traffic on `/api/terminal/ws` with a v2 control-frame protocol and advertised transport capabilities.
Buffer recent PTY output on the server so rebinding clients can replay missed chunks after reconnects or startup races, while keeping SSE as a fallback stream path.
Update the web terminal client and store to negotiate the new transport, track tab lifecycle, and avoid reopening exited sessions when restoring tabs.
* fix(terminal): retry rehydrated websocket reconnects
* fix(terminal): keep reconnect retries silent
* fix(terminal): wire ws stream output and replay in runtime
* fix(web): enable ws proxy for /api in dev
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Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>
