Copy Workspace Data

Copy documents from source workspace to target workspace.

Requires:

• User must have access to source workspace (RLS enforced)
• Target workspace must exist and user must have access
• Workspace-Key header with source workspace key (optional for public workspaces, required for private)
• Target-Workspace-Key header with target workspace key (required)

Copies:

• Document metadata (title, doc_date, shared status, etc.)
• MinIO encrypted files (downloaded to server memory, re-encrypted, uploaded)
• Qdrant vectors (with updated doc_ext_id and chunk_ext_id references)