feat: 排行榜日快照分析 + 数据库连接池/索引调优

- 排行榜改为按天预计算快照(admin_leaderboard_daily_stats),请求只读取合并,重统计移至后台调度;过去日不可变、当天 TTL 刷新,避免在线聚合长时间占用数据库
- 为 runs/tool_call_metrics/llm_call_metrics/threads_meta 增加面向时间段+用户聚合的复合索引(model __table_args__ + migration 20260608_01)
- 连接池可调:DatabaseConfig 新增 max_overflow / pool_timeout,接入 postgres/mysql 引擎;config.yaml 上调 pool_size=20/max_overflow=20
- 新增手动执行的索引脚本 scripts/sql/leaderboard_indexes_mysql.sql(幂等,适用于已存在数据、create_all 不补索引且 alembic 关闭的部署)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/src/components/workspace/settings/skill-settings-page.tsx

@@ -649,17 +649,15 @@ export function SkillRow({
 
   const actionButtons = (
     <>
-      {isAdmin && (
-        <Button
-          size="icon"
-          variant="ghost"
-          className="h-8 w-8 shrink-0"
-          onClick={() => setTagPickerOpen(true)}
-          title={t.adminTags.manageTags}
-        >
-          <TagsIcon className="size-3.5" />
-        </Button>
-      )}
+      <Button
+        size="icon"
+        variant="ghost"
+        className="h-8 w-8 shrink-0"
+        onClick={() => setTagPickerOpen(true)}
+        title={t.adminTags.manageTags}
+      >
+        <TagsIcon className="size-3.5" />
+      </Button>
       {canManage && (
         <Button
           size="icon"
@@ -844,15 +842,13 @@ export function SkillRow({
           </DialogFooter>
         </DialogContent>
       </Dialog>
-      {isAdmin && (
-        <TagPickerDialog
-          open={tagPickerOpen}
-          onOpenChange={setTagPickerOpen}
-          targetType="skill"
-          targetId={skill.name}
-          currentTags={skill.tags ?? []}
-        />
-      )}
+      <TagPickerDialog
+        open={tagPickerOpen}
+        onOpenChange={setTagPickerOpen}
+        targetType="skill"
+        targetId={skill.name}
+        currentTags={skill.tags ?? []}
+      />
       <SkillDetailDialog
         skillName={skill.name}
         open={detailOpen}