fix: apply SSH tuning settings per provider

[EhabY]

Summary

• Share provider-specific tuning between connection setup and Apply Recommended SSH Settings; unsupported providers get no tuning overrides.
• Prefer Devin settings, with a small registered-namespace fallback for Windsurf 2.x. Preserve effective deprecated values during automatic setup.
• Keep constants readonly and exported functions ahead of helpers. Cover automatic/recommended values in a compact provider table using the shared configuration mock.

Closes #1145.

Plan and compatibility decision

Apply only settings the selected Remote-SSH provider reads: Microsoft timeout/grace/max attempts; Cursor timeout/shutdown; Open Remote SSH timeout; Devin/Windsurf timeout/grace/max attempts. IDE branding does not affect selection. Antigravity and unrecognized providers receive no tuning overrides.

Retain the small Windsurf fallback: official release bundles confirm support in 2.0–2.3, and Devin retains migrated settings. No public version-specific usage evidence was found. Namespace detection prefers registered Devin keys over Windsurf keys.

Keep the 30-minute timeout minimum, 8-hour automatic defaults, and opt-in 24-hour recommendations. Leave platform handling, provider-selection precedence, and existing stored keys unchanged. Use table-driven coverage for provider values and focused regressions for migrated values, explicit settings, and idempotence.

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