## Context
App sync fails when a manifest defines an entity with an uppercase UUID
`universalIdentifier`. Postgres `uuid` columns normalize to lowercase on
write, but the sync diff matches `universalIdentifier` strings
case-sensitively. So an uppercase-defined entity never matches its
lowercased DB row and is seen as delete + create on every sync, which
trips downstream guards like "Parent navigation menu item not found".
## Change
Reject non-lowercase `universalIdentifier`s at validation time in
`WorkspaceEntityMigrationBuilderService.validateUniversalIdentifier`
(right after the existing UUID-v4 check). This lives in the abstract
base builder, so it covers every syncable entity type. App authors now
get a clear "must be lowercase" error on the first sync instead of
confusing downstream failures.
Validation is sufficient here, no normalization needed — because the DB
side is always lowercase, so rejecting uppercase input guarantees both
sides of the diff match.
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