feat: add filetree to GET /api/sandboxes response

[sweetmantech]

Summary

• Adds filetree field to GET /api/sandboxes response, fetched from the GitHub API using the account's github_repo URL
• Creates lib/github/parseGitHubRepoUrl.ts to extract owner/repo from GitHub URLs
• Creates lib/github/getRepoFileTree.ts to fetch the recursive file tree via GitHub's Trees API
• Filetree fetch runs in parallel with sandbox status calls for performance

Test plan

• 7 tests for parseGitHubRepoUrl (standard URLs, edge cases, invalid inputs)
• 8 tests for getRepoFileTree (success, missing token, API failures, auth headers)
• 16 tests for getSandboxesHandler (existing tests updated + 4 new filetree tests)
• pnpm build passes with no type errors

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
recoup-api	Ready	Preview	Feb 6, 2026 0:40am

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch sweetmantech/myc-4159-api-filetree-get-apisandboxes-response-add-filetree

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