docs: 重构 API 文档结构并修正源码准确性
- 重组文档目录结构: 每个模块的概述页移动到模块子目录 - 重命名 index.md 为 main.md - 修正所有模块文档中的错误: - math: FromEuler→FromEulerAngles, TransformDirection 包含缩放, Box 是 OBB, Color::ToRGBA 格式 - containers: 新增 operator==/!= 文档, 补充 std::hash DJB 算法细节 - core: 修复 types 链接错误 - debug: LogLevelToString 返回大写, timestamp 是秒, Profiler 空实现标注, Windows API vs ANSI - memory: 修复头文件路径, malloc vs operator new, 新增方法文档 - resources: 修复 Shader/Texture 链接错误 - threading: TaskSystem::Wait 空实现标注, ReadWriteLock 重入描述, LambdaTask 链接 - 验证: fix_links.py 确认 0 个断裂引用
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docs/api/containers/string/operator-subscript.md
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# String::operator[]
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```cpp
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char& operator[](SizeType index);
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const char& operator[](SizeType index) const;
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```
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通过索引访问字符串中的字符。
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**参数:**
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- `index` - 要访问的字符位置(从 0 开始)
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**返回:** 位置 `index` 处字符的引用(可写或只读)
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**复杂度:** O(1)
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**注意:** 不进行边界检查。调用者需确保 `index < Length()`。
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**示例:**
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```cpp
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#include "XCEngine/Containers/String.h"
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#include <iostream>
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int main() {
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XCEngine::Containers::String s("Hello");
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// 只读访问
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for (XCEngine::Containers::String::SizeType i = 0; i < s.Length(); ++i) {
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std::cout << s[i];
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}
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std::cout << std::endl; // 输出: Hello
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// 可写访问
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s[0] = 'J';
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s[1] = 'a';
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s[4] = '!';
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std::cout << s.CStr() << std::endl; // 输出: Jallo!
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// const 版本
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const XCEngine::Containers::String& cs = s;
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char first = cs[0];
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std::cout << "First char: " << first << std::endl; // 输出: First char: J
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return 0;
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}
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```
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## 相关文档
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- [String 总览](string.md) - 返回类总览
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- [Length](size.md) - 获取长度
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