feat: LLM provider configuration, secret store, and setup wizard
Add secure credential storage (GNOME Keyring + file fallback),
LLM provider config in ~/.mcpctl/config.json, interactive setup
wizard (mcpctl config setup), and wire configured provider into
mcplocal for smart pagination summaries.
- Secret store: SecretStore interface, GnomeKeyringStore, FileSecretStore
- Config schema: LlmConfigSchema with provider/model/url/binaryPath
- Setup wizard: arrow-key provider/model selection, dynamic model fetch
- Provider factory: creates ProviderRegistry from config + secrets
- Status: shows LLM line with hint when not configured
- 572 tests passing across all packages
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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