refactor(routing): 暴露 system_locked_domains + 服务端 follow-up 清理(FK/Validate/dedup/exclude单源/共用Store/Builtin保留)

server/migrations/sqlite/000028_routing_profiles.up.sql

@@ -1,5 +1,6 @@
 CREATE TABLE routing_profiles (
   user_id      INTEGER NOT NULL PRIMARY KEY,
   profile_json TEXT NOT NULL,
-  updated_at   DATETIME NOT NULL
+  updated_at   DATETIME NOT NULL,
+  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
 );