* refactor: move session management & port allocation to backend
- Remove the in‑process `activeSessions` map and its cleanup logic from the TypeScript side.
- Introduce new Tauri commands in Rust:
- `get_random_port` – picks an unused port using a seeded RNG and checks availability.
- `find_session_by_model` – returns the `SessionInfo` for a given model ID.
- `get_loaded_models` – returns a list of currently loaded model IDs.
- Update the extension’s TypeScript code to use these commands via `invoke`:
- `findSessionByModel`, `load`, `unload`, `chat`, `getLoadedModels`, and `embed` now operate asynchronously and query the backend.
- Remove the old `is_port_available` command and the custom port‑checking loop.
- Simplify `onUnload` – session termination is now handled by the backend.
- Drop unused helpers (`sleep`, `waitForModelLoad`) and related port‑availability code.
- Add missing Rust imports (`rand::{StdRng,Rng,SeedableRng}`, `HashSet`) and improve error handling.
- Register the new commands in `src-tauri/src/lib.rs` (replace `is_port_available` with the three new commands).
This refactor centralises session state and port allocation in the Rust backend, eliminates duplicated logic, and resolves race conditions around model loading and session cleanup.
* Use String(e) for error
Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>
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Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>
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