Leetcode direct submit

[Certseeds]

Description

1. 对 algorithm 目录内的文件进行了重构, 源文件现在大部分可以直接提交, 使用宏对namespace进行了遮蔽.
2. 适配仓库更名
3. 更新 copyleft 声明方式

[Copilot]

Pull Request Overview

This is a major refactoring of the algorithm project to enable direct submission of LeetCode solutions, updating copyleft declarations, and adapting to repository renaming.

• Replace the old CS203_DSAA build system and macros with ALGORITHM_TEST system for direct LeetCode submission compatibility
• Update copyright declarations from old multi-line format to SPDX-FileCopyrightText format
• Restructure source files to use Solution class wrappers instead of static functions for LeetCode compatibility

Reviewed Changes

Copilot reviewed 299 out of 1103 changed files in this pull request and generated no comments.

File	Description
algorithm/associative_container/*	Refactor to use Solution class pattern and update build macros
algorithm/array/*	Convert static functions to Solution class methods for LeetCode submission
algorithm/2021F/*	Update build system and copyright format across all lab files
CMakeLists.txt files	Change build target names and macro definitions throughout

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