feat: problems local stats, user status, admin panel enhancements, rating text

- Problems page: replace Luogu pass rate with local submission stats
  (local_submit_count, local_ac_count)
- Problems page: add user AC/fail status column (user_ac, user_fail_count)
- Admin users: add total_submissions and total_ac columns
- Admin users: add detail panel with submissions/rating/redeem tabs
- Admin: new endpoint GET /api/v1/admin/users/{id}/rating-history
- Rating history: note field includes problem title via JOIN
- Me page: translate task codes to friendly labels with icons
- Me page: problem links in rating history are clickable
- Wrong book service, learning note scoring, note image controller
- Backend SQL uses batch queries for performance

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/src/domain/json.cc

@@ -59,6 +59,23 @@ Json::Value ToJson(const WrongBookItem& w) {
     j["last_submission_id"] = Json::nullValue;
   }
   j["note"] = w.note;
+  j["note_score"] = w.note_score;
+  j["note_rating"] = w.note_rating;
+  j["note_feedback_md"] = w.note_feedback_md;
+  if (!w.note_images_json.empty()) {
+    Json::Value parsed;
+    Json::CharReaderBuilder b;
+    std::string errs;
+    std::unique_ptr<Json::CharReader> r(b.newCharReader());
+    if (r->parse(w.note_images_json.data(), w.note_images_json.data() + w.note_images_json.size(), &parsed, &errs) && parsed.isArray()) {
+      j["note_images"] = parsed;
+    } else {
+      j["note_images"] = Json::arrayValue;
+    }
+  } else {
+    j["note_images"] = Json::arrayValue;
+  }
+  j["note_scored_at"] = Json::Int64(w.note_scored_at);
   j["updated_at"] = Json::Int64(w.updated_at);
   return j;
 }