refactor(scripts): move Scripts API from scheduler to release-orchestrator

- Fix dual-schema violation (scheduler was writing to scheduler + scripts)
- Move ScriptsDataSource, PostgresScriptStore, script endpoints
- Update gateway routes and UI references
- Each service now owns exactly one schema

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

devops/compose/postgres-init/01-create-schemas.sql

@@ -4,6 +4,7 @@
 CREATE SCHEMA IF NOT EXISTS scanner;
 CREATE SCHEMA IF NOT EXISTS vex;
 CREATE SCHEMA IF NOT EXISTS scheduler;
+CREATE SCHEMA IF NOT EXISTS scripts;
 CREATE SCHEMA IF NOT EXISTS policy;
 CREATE SCHEMA IF NOT EXISTS notify;
 CREATE SCHEMA IF NOT EXISTS notifier;