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/柱状图中最大的矩形.md

@@ -54,27 +54,6 @@ func largestRectangleArea(heights []int) int {
 
 ### Java 实现
 
-```java
-public int largestRectangleArea(int[] heights) {
-    Stack<Integer> stack = new Stack<>();
-    int maxArea = 0;
-    int n = heights.length;
-
-    for (int i = 0; i <= n; i++) {
-        int h = (i == n) ? 0 : heights[i];
-
-        while (!stack.isEmpty() && h < heights[stack.peek()]) {
-            int height = heights[stack.pop()];
-            int width = stack.isEmpty() ? i : i - stack.peek() - 1;
-            maxArea = Math.max(maxArea, height * width);
-        }
-
-        stack.push(i);
-    }
-
-    return maxArea;
-}
-```
 
 ## 复杂度分析