chore(db): drop unused schema and redundant indexes

Удалены мёртвые колонки, fetch_log и избыточные индексы.

Co-authored-by: Cursor <[email protected]>

migrations/sqlite/000022_schema_cleanup.up.sql

@@ -0,0 +1,8 @@
+ALTER TABLE revision_materialized_prefix DROP COLUMN meta_json;
+ALTER TABLE module_domain_entry DROP COLUMN resolve_meta;
+DROP TABLE IF EXISTS module_cdn_fetch_log;
+
+DROP INDEX IF EXISTS idx_rev_mat_prefix_revision;
+DROP INDEX IF EXISTS idx_module_tenant;
+DROP INDEX IF EXISTS idx_module_prefix_snapshot_collected;
+DROP INDEX IF EXISTS idx_rev_mat_prefix_value;