Remove corporate extension support links

[brunobergher]

Summary

• Remove company-era community/contact surfaces from the extension, including the About page Reddit/Discord row, release modal social icons, support email copy, and diagnostics guidance that referenced Roo Code Support.
• Route extension-facing help and support paths to GitHub, including unknown API error reporting, diagnostics file guidance, localized Docs links, and generated provider/help docs links.
• Update extension metadata by changing only src/package.json homepage to https://roocode.github.io, while leaving publisher, repository, package IDs, and referer metadata unchanged.
• Replace the release announcement content with the final Roo Code release notice, including links to the announcement, Roomote, ZooCode, and Cline, with localized strings across the webview locales.
• Scope retired-provider messaging so the Roo Code Router gets the specific sunset explanation, while other retired providers keep a generic unsupported-provider message in API errors, chat warnings, and settings.
• Polish the provider setup welcome screen by removing the left rule and inset padding from the API provider section.

Tests

• pnpm --filter @roo-code/vscode-webview exec vitest run src/components/settings/__tests__/About.spec.tsx src/components/chat/__tests__/Announcement.spec.tsx src/components/chat/__tests__/ChatRow.rate-limit-wait.spec.tsx src/__tests__/ErrorBoundary.spec.tsx
• pnpm --filter roo-cline exec vitest run core/webview/__tests__/diagnosticsHandler.spec.ts
• pnpm --filter @roo-code/vscode-webview exec vitest run src/components/chat/__tests__/Announcement.spec.tsx
• pnpm --filter @roo-code/vscode-webview check-types
• pnpm --filter roo-cline check-types
• pre-commit: turbo lint
• pre-push: turbo check-types

Interactively review PR in Roo Code Cloud