feat: 看板每组显示考试成员榜(排名/姓名/成绩,成绩降序) + 防溢出

api.php

@@ -171,11 +171,42 @@ try {
                 ];
             };
 
+            // 已提交成员榜：按成绩从高到低，缺成绩者排最后，并给出排名
+            $membersOf = static function (array $rs): array {
+                $ms = [];
+                foreach ($rs as $r) {
+                    $ms[] = [
+                        'sid'   => (string)($r['sid'] ?? ''),
+                        'name'  => (string)($r['name'] ?? ''),
+                        'score' => ($r['score'] ?? null),
+                    ];
+                }
+                usort($ms, static function (array $a, array $b): int {
+                    $as = $a['score'];
+                    $bs = $b['score'];
+                    if ($as === null && $bs === null) {
+                        return 0;
+                    }
+                    if ($as === null) {
+                        return 1;   // 无成绩排最后
+                    }
+                    if ($bs === null) {
+                        return -1;
+                    }
+                    return $bs <=> $as;  // 成绩降序
+                });
+                foreach ($ms as $i => $m) {
+                    $ms[$i]['rank'] = $i + 1;
+                }
+                return $ms;
+            };
+
             $classes = [];
             foreach ($byCls as $k => $stu) {
                 $rs  = $rowsByCls[$k] ?? [];
                 $row = $statOf($stu, $rs, $fs);
-                $row['class'] = $k;
+                $row['class']   = $k;
+                $row['members'] = $membersOf($rs);
 
                 // 班级内按组别（A/B 等）再聚合，用于看板下钻对比
                 $stuByGrp  = [];
@@ -191,7 +222,8 @@ try {
                 $groups = [];
                 foreach ($stuByGrp as $g => $gstu) {
                     $gs = $statOf($gstu, $rowsByGrp[$g] ?? [], $fs);
-                    $gs['group'] = $g;
+                    $gs['group']   = $g;
+                    $gs['members'] = $membersOf($rowsByGrp[$g] ?? []);
                     $groups[] = $gs;
                 }
                 usort($groups, static fn(array $a, array $b): int => strcmp((string)$a['group'], (string)$b['group']));