docs: record pre-redesign backup

docs/pre-redesign-backup-20260524.md

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+# 2026-05-24 Pre-Redesign Backup
+
+This record was created before the full platform redesign that replaces the old video-recreation-first product flow.
+
+## Code Restore Point
+
+- Branch at backup time: `main`
+- Commit at backup time: `04a822ac7903aa249b491c68c80b3cd98d88ae85`
+- Remote: `ssh://git@git.kang-kang.com:22222/kangwan/20260512-skg-tk.git`
+- Pushed tag: `backup/pre-redesign-20260524-012047`
+
+Restore tracked code to the exact pre-redesign point:
+
+```bash
+git fetch origin --tags
+git reset --hard backup/pre-redesign-20260524-012047
+```
+
+Only run the reset when intentionally replacing the current working tree.
+
+## Local Data Snapshot
+
+Backup directory:
+
+```text
+.backups/pre-redesign-20260524-012047/
+```
+
+Snapshot contents:
+
+- `api-jobs/` from `api/jobs/`
+- `api-product_library/` from `api/product_library/`
+- `api-character_library/` from `api/character_library/`
+- `api-asset_library/` from `api/asset_library/`
+- `api-prompt_library/` from `api/prompt_library/`
+- `asset_library/` from `asset_library/`
+- `prompt_library/` from `prompt_library/`
+- `jobs/` from `jobs/`
+- `_trash/` from `_trash/`
+- `output/` from `output/`
+- `source-04a822ac7903.tgz`
+- `dirty-worktree.patch`
+
+Verification at backup time:
+
+- Full backup size: `328M`
+- `api/jobs` source task directories: `12`
+- `api-jobs` backup task directories: `12`
+- `api-jobs` backup size: `132M`
+- `api-product_library` backup size: `9.6M`
+- `api-character_library` backup size: `91M`
+
+## Data Restore By Overwrite
+
+Use `ditto` to copy the backed up data over the current runtime data directories:
+
+```bash
+ditto .backups/pre-redesign-20260524-012047/api-jobs api/jobs
+ditto .backups/pre-redesign-20260524-012047/api-product_library api/product_library
+ditto .backups/pre-redesign-20260524-012047/api-character_library api/character_library
+ditto .backups/pre-redesign-20260524-012047/api-asset_library api/asset_library
+ditto .backups/pre-redesign-20260524-012047/api-prompt_library api/prompt_library
+ditto .backups/pre-redesign-20260524-012047/asset_library asset_library
+ditto .backups/pre-redesign-20260524-012047/prompt_library prompt_library
+ditto .backups/pre-redesign-20260524-012047/jobs jobs
+ditto .backups/pre-redesign-20260524-012047/_trash _trash
+ditto .backups/pre-redesign-20260524-012047/output output
+```
+
+`ditto` overwrites matching files but does not delete extra files that were created after the backup. If an exact replacement is required later, remove or move the target directory first, then run the matching `ditto` command.
+
+## Notes
+
+- `.backups/` is ignored by Git and remains local.
+- The pushed Git tag protects the source-code restore point even if the local `.backups/` folder is moved.
+- The only dirty working-tree change at backup time was `.memory/worklog.json`; its diff was saved as `dirty-worktree.patch`.