docs: add backlog todo.md with deferred GUI/CLI items

todo.md

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+# TeleportFling TODO
+
+Backlog of deferred / planned work, tracked outside of milestone milestones.
+
+## Planned
+
+- [ ] **Monitor picker in the GUI** — `stream-index` is currently config-only.
+      Enumerate monitors via the xdg-desktop-portal ScreenCast API and expose
+      a dropdown in the settings window instead of a manual index.
+- [ ] **Surface runtime errors in the GUI** — capture/encode failures currently
+      only hit the log. Show them in the status label (e.g. a denied
+      screen-share dialog) so problems are visible without reading logs.
+- [ ] **`--config` flag** — allow the CLI and GUI to point at a custom config
+      path (`teleportfling --config /path/config.json`). Useful for a future
+      daemon or service and for running multiple profiles side by side.
+
+## Ideas (not yet scoped)
+
+- Live settings changes mid-stream (`flinger.SetConfig` for FPS/quality).
+- Bitrate/bandwidth tuning beyond the balanced 1080p30 default.
+- Screen capture scaling / downsampling.
+- Packaging (Nix package / AppImage / release binaries) — deliberately
+  deferred.