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/include/csp/controllers/admin_controller.h

@@ -27,6 +27,9 @@ class AdminController : public drogon::HttpController<AdminController> {
   ADD_METHOD_TO(AdminController::listRedeemRecords,
                 "/api/v1/admin/redeem-records",
                 drogon::Get);
+  ADD_METHOD_TO(AdminController::userRatingHistory,
+                "/api/v1/admin/users/{1}/rating-history",
+                drogon::Get);
   METHOD_LIST_END
 
   void listUsers(const drogon::HttpRequestPtr& req,
@@ -55,6 +58,10 @@ class AdminController : public drogon::HttpController<AdminController> {
 
   void listRedeemRecords(const drogon::HttpRequestPtr& req,
                          std::function<void(const drogon::HttpResponsePtr&)>&& cb);
+
+  void userRatingHistory(const drogon::HttpRequestPtr& req,
+                         std::function<void(const drogon::HttpResponsePtr&)>&& cb,
+                         int64_t user_id);
 };
 
 }  // namespace csp::controllers

backend/include/csp/controllers/me_controller.h

@@ -22,6 +22,12 @@ public:
                 drogon::Get);
   ADD_METHOD_TO(MeController::upsertWrongBookNote, "/api/v1/me/wrong-book/{1}",
                 drogon::Patch);
+  ADD_METHOD_TO(MeController::scoreWrongBookNote, "/api/v1/me/wrong-book/{1}/note-score",
+                drogon::Post);
+  ADD_METHOD_TO(MeController::uploadWrongBookNoteImages, "/api/v1/me/wrong-book/{1}/note-images",
+                drogon::Post);
+  ADD_METHOD_TO(MeController::deleteWrongBookNoteImage, "/api/v1/me/wrong-book/{1}/note-images",
+                drogon::Delete);
   ADD_METHOD_TO(MeController::deleteWrongBookItem, "/api/v1/me/wrong-book/{1}",
                 drogon::Delete);
   ADD_METHOD_TO(MeController::listRatingHistory, "/api/v1/me/rating-history",
@@ -55,6 +61,18 @@ public:
                       std::function<void(const drogon::HttpResponsePtr &)> &&cb,
                       int64_t problem_id);
 
+  void scoreWrongBookNote(const drogon::HttpRequestPtr &req,
+                         std::function<void(const drogon::HttpResponsePtr &)> &&cb,
+                         int64_t problem_id);
+
+  void uploadWrongBookNoteImages(const drogon::HttpRequestPtr &req,
+                               std::function<void(const drogon::HttpResponsePtr &)> &&cb,
+                               int64_t problem_id);
+
+  void deleteWrongBookNoteImage(const drogon::HttpRequestPtr &req,
+                               std::function<void(const drogon::HttpResponsePtr &)> &&cb,
+                               int64_t problem_id);
+
   void
   deleteWrongBookItem(const drogon::HttpRequestPtr &req,
                       std::function<void(const drogon::HttpResponsePtr &)> &&cb,

backend/include/csp/controllers/note_image_controller.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <drogon/HttpController.h>
+
+namespace csp::controllers {
+
+class NoteImageController : public drogon::HttpController<NoteImageController> {
+ public:
+  METHOD_LIST_BEGIN
+  ADD_METHOD_TO(NoteImageController::getNoteImage, "/files/note-images/{1}", drogon::Get);
+  METHOD_LIST_END
+
+  void getNoteImage(const drogon::HttpRequestPtr& req,
+                    std::function<void(const drogon::HttpResponsePtr&)>&& cb,
+                    const std::string& filename);
+};
+
+}  // namespace csp::controllers

backend/include/csp/domain/entities.h

@@ -86,6 +86,11 @@ struct WrongBookItem {
   int64_t problem_id = 0;
   std::optional<int64_t> last_submission_id;
   std::string note;
+  int32_t note_score = 0;
+  int32_t note_rating = 0;
+  std::string note_feedback_md;
+  std::string note_images_json;  // JSON array of filenames
+  int64_t note_scored_at = 0;
   int64_t updated_at = 0;
 };
 
@@ -127,6 +132,8 @@ struct GlobalLeaderboardEntry {
   std::string username;
   int32_t rating = 0;
   int64_t created_at = 0;
+  int32_t total_submissions = 0;
+  int32_t total_ac = 0;
 };
 
 struct ContestLeaderboardEntry {

backend/include/csp/services/learning_note_scoring_service.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "csp/db/sqlite_db.h"
+#include "csp/domain/entities.h"
+
+#include <cstdint>
+#include <string>
+
+namespace csp::services {
+
+struct LearningNoteScoreResult {
+  int32_t score = 0;
+  int32_t rating = 0;
+  std::string feedback_md;
+  std::string model_name;
+};
+
+class LearningNoteScoringService {
+ public:
+  explicit LearningNoteScoringService(db::SqliteDb& db) : db_(db) {}
+
+  LearningNoteScoreResult Score(const std::string& note,
+                                const domain::Problem& problem);
+
+ private:
+  db::SqliteDb& db_;
+};
+
+}  // namespace csp::services

backend/include/csp/services/wrong_book_service.h

@@ -20,6 +20,13 @@ class WrongBookService {
 
   std::vector<WrongBookEntry> ListByUser(int64_t user_id);
   void UpsertNote(int64_t user_id, int64_t problem_id, const std::string& note);
+  std::string GetNoteImagesJson(int64_t user_id, int64_t problem_id);
+  void SetNoteImagesJson(int64_t user_id, int64_t problem_id, const std::string& note_images_json);
+  void UpsertNoteScore(int64_t user_id,
+                       int64_t problem_id,
+                       int32_t note_score,
+                       int32_t note_rating,
+                       const std::string& note_feedback_md);
   void UpsertBySubmission(int64_t user_id,
                           int64_t problem_id,
                           int64_t submission_id,