fix: improve doc link navigation and tree display
- Fix link resolution with proper relative/absolute path handling - Improve link styling with underline decoration - Hide leaf nodes from tree, only show directories - Fix log file path for packaged app
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docs/api/containers/hashmap/operator-subscript.md
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docs/api/containers/hashmap/operator-subscript.md
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# HashMap::operator[]
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```cpp
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Value& operator[](const Key& key);
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```
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按下标访问键对应的值。如果键不存在,则插入一个默认构造的值并返回引用。
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**参数:**
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- `key` - 要访问的键
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**返回:** 对应值的引用。如果键不存在,则返回一个默认构造的 `Value` 的引用。
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**复杂度:** O(1) 平均,最坏 O(n)(发生 rehash 时)
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**示例:**
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```cpp
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XCEngine::Containers::HashMap<int, std::string> map;
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map[1] = "one"; // 插入键 1,值 "one"
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map[2] = "two"; // 插入键 2,值 "two"
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std::string& value = map[1]; // 获取键 1 对应的值,结果为 "one"
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map[3]; // 插入键 3,值为 std::string 的默认构造值
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```
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## 相关文档
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- [HashMap 总览](hashmap.md) - 返回类总览
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- [Find](find.md) - 查找键对应的值(不插入)
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- [Insert](insert.md) - 插入键值对(不覆盖已存在的键)
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