Add Moonshot provider (official platform API)

[maxitoon]

Summary

• add a new Moonshot provider that uses the official Moonshot balance endpoint instead of the third-party Kimi K2 service
• support International and China regions via config/env + a settings picker
• document the provider and add focused parser/settings/UI regression tests

Details

• adds Sources/CodexBarCore/Providers/Moonshot/ and Sources/CodexBar/Providers/Moonshot/
• keeps Kimi K2 untouched; this only addresses the official Moonshot provider path discussed in The Kimi K2 provider is not official and is misleading #473
• stores Moonshot API keys in ~/.codexbar/config.json and honors MOONSHOT_API_KEY / MOONSHOT_KEY
• honors MOONSHOT_REGION and persists a region value in provider config
• shows Moonshot as a balance-only provider (Balance: $X.XX, No limit set) and surfaces negative cash balance as in deficit

Verification

• swift build --target CodexBarCore
• swift build --target CodexBarCLI
• swift build --target CodexBarWidget
• swift run CodexBarCLI --help (confirms moonshot is registered as a provider)
• MOONSHOT_API_KEY=moonshot-invalid-key MOONSHOT_REGION=international swift run --skip-build CodexBarCLI usage --provider moonshot --format json (confirms a clean Moonshot API error path on invalid auth)

Environment blockers in this session

• swift build --target CodexBar fails in the upstream KeyboardShortcuts dependency because PreviewsMacros is unavailable in this Command Line Tools-only environment
• ./Scripts/lint.sh lint crashes inside swiftlint because SourceKit/Xcode is unavailable here
• no real Moonshot API key was available in the environment, so I could not run the live success-path smoke test or capture screenshots

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Respect MOONSHOT_REGION when no region is configured

context.settings?.moonshot?.region takes precedence here, but this commit also makes Moonshot settings snapshots always carry a value (defaulting to .international when config omits region), so the MoonshotSettingsReader.region(environment:) fallback is effectively never used in normal app/CLI flows. In practice, users who set MOONSHOT_REGION=china (without persisting providerConfig.moonshot.region) will still call api.moonshot.ai, which breaks the documented env-based region selection path.

Useful? React with 👍 / 👎.

[steipete]

Thanks for putting this together. I’m closing this older Moonshot PR because #793 supersedes it: that branch contains the Moonshot provider work from here and adds the Kimi CLI config discovery follow-up in the same thread. Keeping one Moonshot PR open should make review/rebase/landing much cleaner.