refactor: harden task authority and room mutations

src/core/db/player_assets/create-player-assets-tables.sql

@@ -21,9 +21,19 @@ CREATE TABLE IF NOT EXISTS `room_decor_placements` (
   `scale` FLOAT NOT NULL DEFAULT 1 COMMENT '摆件缩放',
   `rotation_degrees` FLOAT NOT NULL DEFAULT 0 COMMENT '摆件旋转角度',
   `z_index` INT NOT NULL DEFAULT 0 COMMENT '摆放层级',
+  `mutation_revision` INT UNSIGNED NOT NULL DEFAULT 0 COMMENT '最后修改该摆件的布局版本',
   `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
   `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
   PRIMARY KEY (`id`),
   UNIQUE KEY `idx_room_decor_placements_user_decor_unique` (`user_id`, `decor_id`),
   KEY `idx_room_decor_placements_user_id` (`user_id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS `room_decor_layout_state` (
+  `user_id` BIGINT NOT NULL COMMENT '关联users.id',
+  `revision` INT UNSIGNED NOT NULL DEFAULT 0 COMMENT '当前布局版本',
+  `last_mutation_id` VARCHAR(64) NULL COMMENT '最后一次幂等mutation ID',
+  `last_mutation_scope` VARCHAR(120) NULL COMMENT '最后一次mutation作用域',
+  `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`user_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;