fix: 采集失败不降级有数据分行+任务领取计数对齐实际分发行数

- 采集失败时按 latest_likes 分流：无数据才标 failed，已有历史数据保持
  success 并注明沿用上次数据，collection_updated_at 不动；run 行照实记失败
- 种子 seedIfEmpty 末尾统一对账 claimed_quantity，杜绝演示数据口径漂移
- 新增 mysql/0021 对账迁移，修复 0020 物理合并遗留的生产计数漂移
- 运营端展示全面改读实时 dist_total（任务卡双面板/项目树/概览/进度），
  project-service 查询补 dist_total 子查询
- 走查实证：卡片 7/18 vs 详情已领取 2 两处口径打架；保存采集计划补采
  失败会把历史成功行改写为 failed

lib/collection-service.ts

@@ -355,14 +355,25 @@ export async function collectDistributionMetrics(
         .bind(message, run.id),
       db
         .prepare(
+          // 已有历史数据（此前采集成功过）的分行失败时不降级为 failed：
+          // 保留 success 状态与数据时间，仅在描述里说明本次刷新失败。
           `UPDATE distributions
-           SET collection_status = 'failed',
-               collection_status_description = ?,
-               collection_updated_at = CURRENT_TIMESTAMP,
+           SET collection_status = CASE
+             WHEN latest_likes IS NULL THEN 'failed'
+             ELSE 'success'
+           END,
+               collection_status_description = CASE
+             WHEN latest_likes IS NULL THEN ?
+             ELSE ?
+           END,
+               collection_updated_at = CASE
+             WHEN latest_likes IS NULL THEN CURRENT_TIMESTAMP
+             ELSE collection_updated_at
+           END,
                updated_at = CURRENT_TIMESTAMP
            WHERE id = ?`,
         )
-        .bind(message, distributionId),
+        .bind(message, `${message}，沿用上次采集数据`, distributionId),
     ]);
     throw error;
   }