Initial commit: secondary school grade archive system.

Add FastAPI/React app with Docker deployment, Ubuntu one-click install, and docs for junior/senior high score tracking and mistake bank.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/school_level.py

@@ -0,0 +1,17 @@
+from app.models.user import SchoolLevel
+
+SCHOOL_LEVEL_LABELS: dict[SchoolLevel, str] = {
+    SchoolLevel.junior_high: "初中",
+    SchoolLevel.senior_high: "高中",
+}
+
+
+def school_level_label(level: SchoolLevel | str | None) -> str:
+    if level is None:
+        return "初中"
+    if isinstance(level, str):
+        try:
+            level = SchoolLevel(level)
+        except ValueError:
+            return "初中"
+    return SCHOOL_LEVEL_LABELS.get(level, "初中")