Re-translate the Japanese version (#1871)

* Retranslate Japanese docs with GPT-5.4

* Retranslate Japanese code with GPT-5.4

ja/codes/zig/chapter_dynamic_programming/climbing_stairs_dfs.zig

@@ -0,0 +1,31 @@
+// File: climbing_stairs_dfs.zig
+// Created Time: 2023-07-15
+// Author: codingonion (coderonion@gmail.com)
+
+const std = @import("std");
+
+// 検索
+fn dfs(i: usize) i32 {
+    // dp[1] と dp[2] は既知なので返す
+    if (i == 1 or i == 2) {
+        return @intCast(i);
+    }
+    // dp[i] = dp[i-1] + dp[i-2]
+    var count = dfs(i - 1) + dfs(i - 2);
+    return count;
+}
+
+// 階段登り：探索
+fn climbingStairsDFS(comptime n: usize) i32 {
+    return dfs(n);
+}
+
+// Driver Code
+pub fn main() !void {
+    comptime var n: usize = 9;
+
+    var res = climbingStairsDFS(n);
+    std.debug.print("{} 段の階段を上る方法は全部で {} 通り\n", .{ n, res });
+
+    _ = try std.io.getStdIn().reader().readByte();
+}