codeSplitter: move the live resources and the Alchemy app name off codesplitters (copy the data first) #809

Split from #805. These names stay codesplitters because renaming them in config makes Alchemy create a new, empty resource and delete the old one:

• D1 codesplitters-db
• Queues codesplitters-hooks, codesplitters-jobs, codesplitters-level-digs
• R2 codesplitters-level-chunks
• Vectorize codesplitters-vectors
• Artifacts namespace codesplitters
• The Alchemy app name (name: "codesplitters" in apps/codesplitter/rustybuns.config.ts), which keys the Alchemy state and the desktop's ~/.codesplitters data dir

Moving any of them means copying the data first: export D1 into a new codesplitter-db, copy R2 objects, re-embed or copy vectors, drain the queues before switching, and copy Artifacts repos. Then the desktop has to read ~/.codesplitters when ~/.codesplitter is missing.

The copy scripts and config can be a PR. The live copy and the deploy are the owner's (see #806 for the state move that has to come first).

Nothing is broken today: the names only show in the Cloudflare dashboard.

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