feat: multi-remote mobile settings

[Dimillian]

Summary

This PR keeps the new multi-remote settings flow for remote TCP usage and removes Orbit support end-to-end.

Remote mode is now TCP-only (for desktop + iOS over user infrastructure, typically Tailscale).

What changed

• Kept multi-remote management in Settings:
  • add/select/reorder/delete remote profiles
  • host/token drafts, validation, and save flow
• Simplified remote provider model to TCP-only:
  • removed provider selector and related WIP provider UI
  • removed Orbit-specific fields/types/actions from frontend contracts
• Kept and focused iOS remote onboarding on TCP:
  • Connect & test flow remains
  • Tailscale helper + daemon controls remain on desktop Server settings
• Removed Orbit command surfaces and transports in backend/daemon:
  • deleted Orbit transport/runtime modules
  • removed Orbit RPC methods and CLI mode/args
  • remote backend routing now uses TCP path only
• Added legacy settings sanitation for compatibility:
  • non-TCP legacy provider values are normalized to TCP when settings are read
• Documentation cleanup:
  • replaced Orbit/Cloudflare iOS blueprint with canonical Tailscale/TCP blueprint
  • updated README and codebase map references

Why

The goal is to keep the new multi-remote TCP capabilities while removing Orbit complexity and dead paths, leaving one clear and supported remote architecture.

Validation

• npm run typecheck
• npm run test -- src/services/tauri.test.ts src/features/settings/components/SettingsView.test.tsx
• cd src-tauri && cargo check

All commands passed.

[Dimillian]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Nice work!

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