docs: move backlog to Gitea issue tracker

Replace todo.md with a pointer to the issue tracker. Feature requests
created as issues #1-#6 on gitea.edley.me.

todo.md

@@ -1,35 +1,18 @@
 # TeleportFling TODO
 
-Backlog of deferred / planned work, tracked outside of milestone milestones.
+Backlog items have moved to the issue tracker on the Gitea instance:
 
-## Planned
+https://gitea.edley.me/petere/TeleportFling/issues
 
-- [x] **Monitor picker in the GUI** — monitors are enumerated via hyprctl
-      (Hyprland) and shown as a dropdown in the settings window; the selected
-      monitor persists as `stream_index`. Falls back to a single indexed
-      option on other compositors.
-- [x] **Surface runtime errors in the GUI** — the engine records the most
-      recent capture/encode/packet/audio error and the GUI shows it in the
-      status label and tray tooltip (highlighted as a danger).
-- [x] **`--config` flag** — the CLI and GUI accept a custom config path
-      (`teleportfling --config /path/config.json`); explicit CLI flags
-      override file values. Used by the systemd daemon unit in contrib/.
-- [x] **Run as a daemon** — `contrib/install-daemon.sh` installs a per-user
-      systemd unit (`contrib/teleportfling.service`) that starts the headless
-      CLI with its own config at `~/.config/teleportfling/daemon.json`.
+Open feature requests:
 
-## Future / Ideas (not yet scoped)
+1. Live settings changes mid-stream
+2. Bitrate / bandwidth tuning
+3. Screen capture scaling / downsampling
+4. Multi-monitor verification
+5. Non-Hyprland monitor enumeration
+6. Packaging verification on real machines
 
-- [ ] **Live settings changes mid-stream** — `flinger.SetConfig` for FPS/quality
-      without a restart.
-- [ ] **Bitrate / bandwidth tuning** — options beyond the balanced 1080p30
-      default.
-- [ ] **Screen capture scaling / downsampling** — capture a scaled region rather
-      than the monitor's native resolution.
-- [ ] **Multi-monitor verification** — the GUI monitor picker enumerates via
-      hyprctl; confirm behaviour on a real multi-monitor setup.
-- [ ] **Non-Hyprland monitor enumeration** — portal-based fallback so the picker
-      works on GNOME/KDE etc. (currently falls back to a single indexed option).
-- [ ] **Packaging** — Nix flake package, AppImage, and `.deb` for Debian/Ubuntu
-      (in progress: flake package, AppImage and .deb scripts added under
-      packaging/; verify on a real Debian/Ubuntu machine).
+Completed items (monitor picker, runtime errors in GUI, `--config` flag,
+daemon mode, packaging scripts) are closed in git history — see the README
+and project.md for current capabilities.