[6.5] Build knowledge base management UI (upload, tag, delete)

[jasminetay-moe]

As an Engineer, I want to build a knowledge base management UI so that domain owners can manage their materials without needing direct storage access.

Acceptance criteria

• Upload materials (PDF, Word, HTML)
• Tag materials by domain
• Delete materials
• Upload triggers re-ingestion into RAG pipeline (Part 1)
• Access restricted to authorised domain owners per 6.6
• Trigger interface agreed with [1.9] Document refresh process (knowledge base currency) #14 (1.9) engineer before build begins (e.g. webhook, queue, or scheduled scan)

Dependencies

• Coordinate with: [1.9] Document refresh process (knowledge base currency) #14 (1.9) — document refresh process (backend trigger that this UI fires)
• Blocked by: #51 (6.6) — domain-scoped access control

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📄 PRD: Part 6 — Glow CI PRD