fix: enable Codex Apply/Reset buttons when CLI is installed (closes #591)

[anuragg-saxenaa]

Closes #591

Issue: Codex CLI card showed Connected but Apply and Reset buttons were unavailable/disabled, making it impossible to configure or reset settings even when the CLI was installed.

Root Cause:

• Apply button was disabled when selectedApiKey was empty — but sk_9router is a valid default key for local 9router, so it should be enabled even without an explicit selection
• Reset button was disabled when has9Router was false — but users should always be able to reset, even if 9router was not previously configured

Fix:

• Apply: enable when model is selected AND (API key is selected OR no cloud enabled with sk_9router default OR no keys available)
• Reset: always enabled when CLI is installed (remove the has9Router check)
• Buttons remain disabled while loading (applying/restoring states)