The /api/my/meshes/:slug PATCH route was never implemented and
better-auth's enforceAuth middleware can't validate the CLI's
device-code JWT (signed with CLI_SYNC_SECRET, not a better-auth
session). Adds /api/cli/meshes/:slug on the web app — verifies
the HS256 JWT inline, scopes the rename to (slug, ownerUserId).
CLI now calls the new path. Mirrors the cli-sync-token pattern.
Closes the "API error 401: Unauthorized" hit after a successful
claudemesh login.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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