Add organizations.handle and workspaces table

[RhysSullivan]

Adds a local URL handle to organizations (slugified from name with
collision suffixes) plus the workspaces table the cloud-workspaces plan
needs. The migration backfills handles for existing rows in a single CTE
update before flipping the column to NOT NULL UNIQUE.

upsertOrganization picks a free handle on first insert and keeps it
stable across name renames; pickFreeOrgHandle is exported so the test
seed worker uses the same algorithm.

[RhysSullivan]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• WIP: move file routes under /$org and reshape auth.me #507 : 2 dependent PRs (#508 , #514 )
• Add scope-stack builders, URL-context resolver, workspace executor #506
• Add workspaces CRUD API under OrgHttpApi #505
• Cut over scope ids to deterministic prefixed form #504
• Add organizations.handle and workspaces table #503 👈 (View in Graphite)
• Add cloud id helpers: prefixed local ids, scope id constructors, handle slugifier #502
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

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commit: af96d76

[RhysSullivan]

slug not handle