fix(website): publish failed with uuid type error on Better-Auth ids

published_by, created_by, and space_id were declared as uuid, but
Mana user + space ids are Better-Auth nanoids stored as text. The
insert into website.published_snapshots raised `invalid input syntax
for type uuid` and Hono swallowed it as a generic 500.

Changes:
- schema.ts: uuid -> text on the three columns
- 0003_fix_id_types.sql: ALTER COLUMN on existing installs
- publish.ts: replace UUID regex on X-Mana-Space with a nanoid-shaped
  check (it was silently nulling valid space ids)
- publish.ts: log + return the actual error message on the 500 path
  so the next unhandled failure is visible instead of opaque

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/api/drizzle/website/0003_fix_id_types.sql

@@ -0,0 +1,18 @@
+-- Website module — fix id column types.
+--
+-- `published_by`, `created_by`, and `space_id` were originally declared
+-- as `uuid`, but Mana user ids (auth.users.id) and space ids
+-- (auth.organizations.id) are Better-Auth nanoids stored as `text`.
+-- Publishing failed with `invalid input syntax for type uuid`.
+--
+-- Apply with:
+--   psql "$DATABASE_URL" -f apps/api/drizzle/website/0003_fix_id_types.sql
+
+ALTER TABLE "website"."published_snapshots"
+	ALTER COLUMN "published_by" TYPE text;
+
+ALTER TABLE "website"."published_snapshots"
+	ALTER COLUMN "space_id" TYPE text;
+
+ALTER TABLE "website"."custom_domains"
+	ALTER COLUMN "created_by" TYPE text;