[Feature]: Import SSH config servers directly on mobile (without desktop)

### Problem or use case

Mobile users cannot import SSH configuration / server hosts directly on the phone. Today it appears they need to go through the desktop version (pair with desktop, manage hosts there) rather than adding or importing SSH targets on mobile itself.

**User report (WeChat, translated):**
1. Is it not possible to directly import an SSH configuration from a server on a mobile device?
2. Is it possible to bypass the desktop version?

Short summary: allow Orca Mobile to import/add SSH servers from SSH config (or equivalent) without requiring the desktop app as an intermediary.

### Proposed solution

On Orca Mobile, support importing SSH hosts/servers from an SSH config (or pasting/uploading equivalent host entries) so users can connect to remote servers without first setting them up via the desktop app.

Possible shapes (open to product design):
- Import / parse `~/.ssh/config`-style host entries on mobile (file pick, paste, or share sheet)
- Manually add SSH host entries on mobile with the same fields desktop uses
- Connect mobile directly to those hosts (or to a remote Orca server on those hosts) without pairing through a desktop instance first

### Alternatives or additional context

- **Source:** user feedback via WeChat (user: 乱序).
- Related but not the same:
- #2647 — SSH config `Include` support (desktop import mechanics)
- #8489 — paired Desktop managing SSH targets on a headless server
- #2471 / #7208 / #8147 — relay / remote connectivity for mobile companion (network path, not SSH config import UX)
- #4501 — headless server mode + multi-remote connect
- If full on-device SSH config import is out of scope for mobile beta, a smaller win would still help: add/import SSH hosts on mobile without requiring a paired desktop workflow.