feat: profile avatar, callback setUser fix, admin description/thumbnail, pagination limit=100

frontend/src/components/UserBadge.tsx

@@ -9,6 +9,17 @@ export default function UserBadge({ user }: UserBadgeProps) {
 
   return (
     <span className="flex items-center gap-2">
+      {user.avatar ? (
+        <img
+          src={user.avatar}
+          alt={user.nickname}
+          className="h-6 w-6 rounded-full object-cover border border-od-border"
+        />
+      ) : (
+        <span className="flex h-6 w-6 items-center justify-center rounded-full bg-od-surface border border-od-border font-mono text-[10px] text-od-accent">
+          {user.nickname[0].toUpperCase()}
+        </span>
+      )}
       <span className="font-mono text-xs text-od-accent">{user.nickname}</span>
       <span className="font-mono text-[10px] px-1.5 py-0.5 rounded border border-od-border text-od-muted">
         {planLabel}