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>

frontend/src/app/me/page.tsx

@@ -143,8 +143,19 @@ export default function MePage() {
       first_ac: ["首次通过 ⭐", "First AC ⭐"],
       code_quality: ["代码质量 🛠️", "Code Quality 🛠️"],
     };
-    if (type === "daily_task" && taskLabels[note]) {
-      return isZh ? taskLabels[note][0] : taskLabels[note][1];
+    if (type === "daily_task") {
+      if (taskLabels[note]) {
+        return isZh ? taskLabels[note][0] : taskLabels[note][1];
+      }
+      // Note score: "note_score_1234"
+      const ns = note.match(/^note_score_(\d+)$/);
+      if (ns) {
+        return (
+          <a href={`/problems/${ns[1]}`} className="hover:underline text-[color:var(--mc-diamond)]">
+            {isZh ? `📜 探索笔记鉴定 P${ns[1]}` : `📜 Note Appraisal P${ns[1]}`}
+          </a>
+        );
+      }
     }
     // Solution view: "Problem 1234:Title"
     const m = note.match(/^Problem (\d+):(.*)$/);