Add implementation plan for admin media manager
Eleven TDD tasks from migration through editor integration: model, service (store/rename/delete + auto-suffix), admin CRUD controller, real Blade UI, auth-gated download, listener Phase-1 logical-path rewrite for Image+Link nodes, and ImageUploadController rewiring. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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