feat: migrate /problem/level

src/openapi.yaml

@@ -36,8 +36,6 @@ paths:
           description: "TODO"
   /problem/class:
     $ref: "./paths/problem/class.yaml#/paths/Path"
-  /problem/level:
-    $ref: "./paths/problem/level.yaml#/paths/Path"
   /ranking/tier:
     $ref: "./paths/ranking/tier.yaml#/paths/Path"
   /ranking/class:

src/operations/problem/_barrel.tsp

@@ -1,2 +1,3 @@
 import "./show.tsp";
 import "./lookup.tsp";
+import "./level.tsp";

src/operations/problem/level.tsp

@@ -0,0 +1,74 @@
+using TypeSpec.Http;
+using TypeSpec.OpenAPI;
+
+namespace SolvedAC;
+
+/**
+ * 난이도별 문제 수를 가져옵니다.
+ *
+ * @return
+ *     난이도별 문제 수
+ */
+@summary("난이도별 문제 수 가져오기")
+@tag("problem")
+@get
+@route("/problem/level")
+op getProblemsCountGroupByLevel(
+  /**
+   * 응답을 받을 언어입니다.
+   */
+  @header
+  `x-solvedac-language`?: Language,
+): GetProblemsCountGroupByLevel.Ok;
+
+namespace GetProblemsCountGroupByLevel {
+  /**
+   * @example
+   *     [
+   *         { "level": 0, "count": 7159 },
+   *         { "level": 1, "count": 154 },
+   *         { "level": 2, "count": 271 },
+   *         { "level": 3, "count": 696 },
+   *         { "level": 4, "count": 893 },
+   *         { "level": 5, "count": 782 },
+   *         { "level": 6, "count": 771 },
+   *         { "level": 7, "count": 828 },
+   *         { "level": 8, "count": 914 },
+   *         { "level": 9, "count": 959 },
+   *         { "level": 10, "count": 1021 },
+   *         { "level": 11, "count": 973 },
+   *         { "level": 12, "count": 1386 },
+   *         { "level": 13, "count": 1291 },
+   *         { "level": 14, "count": 1126 },
+   *         { "level": 15, "count": 1023 },
+   *         { "level": 16, "count": 1178 },
+   *         { "level": 17, "count": 1121 },
+   *         { "level": 18, "count": 1165 },
+   *         { "level": 19, "count": 1126 },
+   *         { "level": 20, "count": 891 },
+   *         { "level": 21, "count": 904 },
+   *         { "level": 22, "count": 850 },
+   *         { "level": 23, "count": 602 },
+   *         { "level": 24, "count": 440 },
+   *         { "level": 25, "count": 352 },
+   *         { "level": 26, "count": 281 },
+   *         { "level": 27, "count": 149 },
+   *         { "level": 28, "count": 93 },
+   *         { "level": 29, "count": 32 },
+   *         { "level": 30, "count": 28 }
+   *     ]
+   */
+  @extension(XInternal, true)
+  model Ok {
+    @statusCode status: 200;
+    items: LevelEntry[];
+  }
+  model LevelEntry {
+    level: ProblemLevel;
+
+    /**
+     * 문제 수입니다.
+     */
+    count: uint64;
+  }
+}