fix(/provider): add Anthropic option to switch back without restarting (#1426)

[ajsai47]

Problem

Fixes #1426.

Once a third-party provider was activated via /provider, the "Set active provider" screen offered no path back to Anthropic. Users had to manually edit ~/.openclaude.json, set activeProviderProfileId to null, clear providerProfiles, and fully restart. Even then, openclaude auth status still showed authMethod: third_party until the restart completed.

Root cause

renderProfileSelection in ProviderManager.tsx only listed saved third-party profiles and (optionally) GitHub Models. There was no Anthropic entry and no function to clear the active provider profile from config.

Fix

src/utils/providerProfiles.ts

• Add clearActiveProviderProfile() — sets activeProviderProfileId: undefined in global config and deletes the startup profile file so Anthropic is used on next launch too

src/utils/providerProfile.ts

• Export PROFILE_ENV_KEYS (was const) so ProviderManager can use the authoritative list of provider env vars to wipe

src/components/ProviderManager.tsx

• Add ANTHROPIC_PROVIDER_ID = '__anthropic__' sentinel
• Add includeAnthropic option to renderProfileSelection — appends "Anthropic / Claude" to the list, marked "(active)" when no third-party profile is set
• Pass includeAnthropic: true to the select-active screen
• Handle the sentinel in activateSelectedProvider: calls clearActiveProviderProfile(), wipes all PROFILE_ENV_KEYS from process.env, clears the startup override — switch takes effect immediately without a restart

src/utils/providerProfiles.test.ts

• New test: activates an OpenAI provider profile, then calls clearActiveProviderProfile() and asserts activeProviderProfileId is cleared

Test plan

• Start with Anthropic (default)
• Run /provider → add a DeepSeek profile → activate it
• Confirm DeepSeek is used for a message
• Run /provider → "Set active provider" → select "Anthropic / Claude"
• Confirm the next message uses Anthropic without restarting
• Restart OpenClaude — confirm it still starts on Anthropic
• bun test src/utils/providerProfiles.test.ts — 193 pass, 0 fail

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