feat(zoo-gateway): auth callback and multi-profile token sync

[JamesRobert20]

Summary

• Propagates OAuth callback token to all ClineProvider instances (sequential writes to avoid profile-store races)
• Seeds/syncs zoo-gateway profiles, including non-active profiles for model fetch
• Clears in-memory active profile on sign-out even when disk is already clean

Part 3 of the Zoo Gateway stack. Depends on PR2 (stacked on #344).

Test plan

• handleUri multi-instance + serialization tests
• webviewMessageHandler separate-profile lookup test
• Manual: sign in/out across multiple profiles

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• Commit unit tests in branch feat/zoo-gateway-auth-sync

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[codecov]

Codecov Report

❌ Patch coverage is 85.82090% with 19 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/core/webview/ClineProvider.ts	83.75%	13 Missing ⚠️
src/core/webview/webviewMessageHandler.ts	88.23%	6 Missing ⚠️

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