refactor: remove Java code sections from all LeetCode Hot 100 markdown files

- Remove all "## Java 解法" sections and Java code blocks
- Replace "## Go 解法" with "## 解法"
- Remove "### Go 代码要点" and "### Java 代码要点" sections
- Keep all Go code sections intact
- Maintain complete documentation structure and content
- Update 22 markdown files in the LeetCode Hot 100 directory

16-LeetCode Hot 100/无重复字符的最长子串.md

@@ -81,40 +81,8 @@ func lengthOfLongestSubstring(s string) int {
 
 ---
 
-## Java 解法
+## 解法
 
-```java
-class Solution {
-    public int lengthOfLongestSubstring(String s) {
-        // 记录字符最后出现的位置
-        Map<Character, Integer> charIndex = new HashMap<>();
-        int maxLength = 0;
-        int left = 0;
-
-        for (int right = 0; right < s.length(); right++) {
-            char char = s.charAt(right);
-
-            // 如果字符已存在且在窗口内，移动左边界
-            if (charIndex.containsKey(char) && charIndex.get(char) >= left) {
-                left = charIndex.get(char) + 1;
-            }
-
-            // 更新字符位置
-            charIndex.put(char, right);
-
-            // 更新最大长度
-            maxLength = Math.max(maxLength, right - left + 1);
-        }
-
-        return maxLength;
-    }
-}
-```
-
-### Java 代码要点
-1. `HashMap` 记录字符索引
-2. `charAt()` 遍历字符串
-3. `Math.max()` 更新最大值
 
 ---