(docs): establish licensing boundaries

[kyeunga25]

Summary

• add a bilingual proprietary source-evaluation licence for repository-owned material
• define separate rights for user content, provider output, presets, branding, and third-party services
• mark the root and every workspace package as UNLICENSED

Verification

• format, lint, typecheck, unit, Worker, build, public-config, and Cloudflare dry-run gates
• Playwright 57/57
• pnpm audit --audit-level high
• staged privacy and sensitive-value scan

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	studymix-ai	39e4467	Aug 31 2026, 10:39 PM