feat(ko): add the Korean online edition (#2006)

* feat(ko): add the complete Korean online edition

* Use UTF-8 for Python CI output on Windows

* Remove print-book promotion from the Korean site

* fix(ko): preserve emphasis before Korean particles

ko/codes/java/chapter_divide_and_conquer/fast_power.java

@@ -0,0 +1,27 @@
+/**
+ * File: fast_power.java
+ * Created Time: 2026-08-18
+ * Author: Hello Algo Team
+ */
+
+package chapter_divide_and_conquer;
+
+public class fast_power {
+    /* 빠른 거듭제곱 */
+    static int fastPow(int x, int n) {
+        if (n == 0) {
+            return 1;
+        }
+        int half = fastPow(x, n / 2);
+        if (n % 2 == 0) {
+            return half * half;
+        }
+        return half * half * x;
+    }
+
+    public static void main(String[] args) {
+        assert fastPow(7, 0) == 1;
+        assert fastPow(3, 5) == 243;
+        assert fastPow(2, 6) == 64;
+    }
+}