feat: export Catalog Studio assets and SQL to catalog repository

.env.example

@@ -76,3 +76,8 @@ LOG_LEVEL=error
 
 # --- FLARESOLVERR (Cloudflare bypass for clone sources) ---
 FLARESOLVERR_URL=http://localhost:8191
+
+# Catalog Studio export: dedicated clean clone on Beta-3 with Git push credentials.
+CATALOG_GIT_CHECKOUT=
+# Persistent directory shared by CMS and worker, outside the catalog clone.
+CATALOG_GIT_STATE_DIR=