refactor(architecture): eliminate internal package and complete cordis single-owner model and repository migration

- Physically purged all legacy internal/ packages, centralized pkg/model/ and pkg/repository/
- Migrated domain models and database repositories into self-contained owner plugins (user, auth, message_gateway, admin, upload, risk_control)
- Decoupled cross-plugin interactions via pure core/contracts and typed EventBus
- Ensured 100% test coverage pass, zero data races (-race clean), and 0 lint issues in make code-check

scripts/update_go_license.sh

@@ -55,9 +55,7 @@ find_go_files() {
     -o -path './docs' \
     -o -path './frontend/node_modules' \
     -o -path './frontend/.next' \
-    -o -path './frontend/out' \
-    -o -path './internal/router/dist' \
-    -o -path './internal/router/root/dist' \
+    -o -path './plugins/drivers/driver_http/dist' \
     -o -path './vendor' \) -prune \
     -o -type f -name '*.go' -print
 }