Re-translate the Japanese version (#1871)

* Retranslate Japanese docs with GPT-5.4

* Retranslate Japanese code with GPT-5.4

ja/codes/javascript/chapter_dynamic_programming/climbing_stairs_dfs.js

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+/**
+ * File: climbing_stairs_dfs.js
+ * Created Time: 2023-07-26
+ * Author: yuan0221 (yl1452491917@gmail.com)
+ */
+
+/* 検索 */
+function dfs(i) {
+    // dp[1] と dp[2] は既知なので返す
+    if (i === 1 || i === 2) return i;
+    // dp[i] = dp[i-1] + dp[i-2]
+    const count = dfs(i - 1) + dfs(i - 2);
+    return count;
+}
+
+/* 階段登り：探索 */
+function climbingStairsDFS(n) {
+    return dfs(n);
+}
+
+/* Driver Code */
+const n = 9;
+const res = climbingStairsDFS(n);
+console.log(`${n} 階の階段を上る方法は全部で ${res} 通り`);