feat: add cloud quota usage display and version pruning

[rubenfiszel]

Summary

• Adds GET /w/{workspace}/workspaces/cloud_quotas endpoint returning current usage counts, limits, and prunable version counts for scripts, flows, apps, variables, and resources
• Adds POST /w/{workspace}/workspaces/prune_versions endpoint to delete old non-HEAD versions of scripts, flows, or apps (admin-only, cloud-only)
• Adds CloudQuotas component in workspace settings General tab (cloud only) showing a quota usage table with prune buttons and a confirmation drawer

Test plan

• cargo check passes
• npm run check passes (0 errors)
• Manual: temporarily set isCloudHosted() to true, navigate to workspace settings > General tab, verify quota table renders
• Manual: verify prune buttons appear when prunable > 0, drawer opens with correct counts
• Manual: verify pruning succeeds and counts update after prune

🤖 Generated with Claude Code

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