feat: note scoring 60/6 with rating award + Minecraft theme

- Score max changed from 100 to 60, rating max from 10 to 6
- Note scoring now awards actual rating points (delta-based)
- Re-scoring only awards/deducts the difference
- Rating history shows note_score entries with problem link
- LLM prompt includes problem statement context for better evaluation
- LLM scoring dimensions: 题意理解/思路算法/代码记录/踩坑反思 (15 each)
- Minecraft-themed UI: 矿石鉴定, 探索笔记, 存入宝典, etc.
- Fallback scoring adjusted for 60-point scale
- Handle LLM markdown code fence wrapping in response

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

backend/src/services/wrong_book_service.cc

@@ -195,4 +195,59 @@ void WrongBookService::Remove(int64_t user_id, int64_t problem_id) {
   sqlite3_finalize(stmt);
 }
 
+int32_t WrongBookService::GetNoteRating(int64_t user_id, int64_t problem_id) {
+  sqlite3* db = db_.raw();
+  sqlite3_stmt* stmt = nullptr;
+  const char* sql = "SELECT note_rating FROM wrong_book WHERE user_id=? AND problem_id=? LIMIT 1";
+  CheckSqlite(sqlite3_prepare_v2(db, sql, -1, &stmt, nullptr), db,
+              "prepare get note_rating");
+  CheckSqlite(sqlite3_bind_int64(stmt, 1, user_id), db, "bind user_id");
+  CheckSqlite(sqlite3_bind_int64(stmt, 2, problem_id), db, "bind problem_id");
+  int32_t rating = 0;
+  if (sqlite3_step(stmt) == SQLITE_ROW) {
+    rating = sqlite3_column_int(stmt, 0);
+  }
+  sqlite3_finalize(stmt);
+  return rating;
+}
+
+void WrongBookService::AwardNoteRating(int64_t user_id, int64_t problem_id, int delta) {
+  sqlite3* db = db_.raw();
+
+  // Update user rating
+  {
+    sqlite3_stmt* stmt = nullptr;
+    const char* sql = "UPDATE users SET rating=rating+? WHERE id=?";
+    CheckSqlite(sqlite3_prepare_v2(db, sql, -1, &stmt, nullptr), db,
+                "prepare add note rating");
+    CheckSqlite(sqlite3_bind_int(stmt, 1, delta), db, "bind delta");
+    CheckSqlite(sqlite3_bind_int64(stmt, 2, user_id), db, "bind user_id");
+    CheckSqlite(sqlite3_step(stmt), db, "exec add note rating");
+    sqlite3_finalize(stmt);
+  }
+
+  // Log to daily_task_logs for rating history visibility
+  {
+    sqlite3_stmt* stmt = nullptr;
+    const char* sql =
+        "INSERT INTO daily_task_logs(user_id,task_code,day_key,reward,created_at) "
+        "VALUES(?,?,?,?,?)";
+    CheckSqlite(sqlite3_prepare_v2(db, sql, -1, &stmt, nullptr), db,
+                "prepare note rating log");
+    const std::string task_code = "note_score_" + std::to_string(problem_id);
+    const int64_t now = NowSec();
+    // Use a unique day_key to avoid IGNORE conflicts
+    const std::string day_key = "note_" + std::to_string(now);
+    CheckSqlite(sqlite3_bind_int64(stmt, 1, user_id), db, "bind user_id");
+    CheckSqlite(sqlite3_bind_text(stmt, 2, task_code.c_str(), -1, SQLITE_TRANSIENT), db,
+                "bind task_code");
+    CheckSqlite(sqlite3_bind_text(stmt, 3, day_key.c_str(), -1, SQLITE_TRANSIENT), db,
+                "bind day_key");
+    CheckSqlite(sqlite3_bind_int(stmt, 4, delta), db, "bind reward");
+    CheckSqlite(sqlite3_bind_int64(stmt, 5, now), db, "bind created_at");
+    CheckSqlite(sqlite3_step(stmt), db, "insert note rating log");
+    sqlite3_finalize(stmt);
+  }
+}
+
 }  // namespace csp::services