Add managed product updates and public changelog

apps/api/drizzle/0015_changelog_cleanup.sql

@@ -0,0 +1,26 @@
+-- Changelog management (docs/changelog-management.md).
+-- 1. Remove the product-update GitHub import's stored personal access tokens.
+--    Only `integrations` rows for the removed "github" provider are deleted;
+--    the docs/pages GitHub App lives in documentation_git_* tables and the
+--    SendLit key ("sendlit" rows) is untouched.
+DELETE FROM "integrations" WHERE "provider" = 'github';
+--> statement-breakpoint
+-- 2. Normalize changelog meta (published and draft) to the new contract: an
+--    entry is a title, body and optional release date. releaseDate is reduced
+--    to YYYY-MM-DD (GitHub imports stored a timestamp) and the removed
+--    "version", "labels" and import-only "github" keys are dropped.
+CREATE OR REPLACE FUNCTION pg_temp.frontlit_changelog_meta(m jsonb) RETURNS jsonb
+LANGUAGE sql IMMUTABLE AS $$
+  SELECT (coalesce(m, '{}'::jsonb) - 'github' - 'version' - 'labels' - 'releaseDate')
+    || CASE
+      WHEN m ->> 'releaseDate' ~ '^\d{4}-\d{2}-\d{2}'
+        THEN jsonb_build_object('releaseDate', left(m ->> 'releaseDate', 10))
+      ELSE '{}'::jsonb
+    END
+$$;
+--> statement-breakpoint
+UPDATE "documents"
+SET
+  "meta" = pg_temp.frontlit_changelog_meta("meta"),
+  "draft_meta" = pg_temp.frontlit_changelog_meta("draft_meta")
+WHERE "kind" = 'changelog';