feat: 改进模板, 移除 2018fall, 修改模板放置历年代码方式

[Certseeds]

Description

1. 整改已有模板.
2. 采用新方式储存历年代码

Type of change

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

之后历年代码将不会在存储在release/master分支上, 而是在 master分支某个tag衍生出的{year}fall {year}spring子分支上.

How Has This Been Tested?

Local test Pass

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[Copilot]

Pull Request Overview

This pull request removes all 2018fall lab code and associated resources, implementing a new approach for storing historical semester code. Instead of maintaining these files in the release/master branches, historical code will now be stored in dedicated semester-specific branches (e.g., {year}fall, {year}spring) derived from tags on the master branch.

Key Changes:

• Complete removal of the 2018fall directory structure
• Elimination of all lab assignments (labs 4-8) including source code, tests, and resources
• Removal of build configuration files (pom.xml) for the 2018fall semester
• Deletion of documentation and submission statistics

Reviewed Changes

Copilot reviewed 299 out of 579 changed files in this pull request and generated no comments.

File	Description
Multiple 2018fall/lab_*/ directories	Removes entire 2018fall lab structure including all source files, test files, resources, READMEs, and Maven configurations
2018fall/pom.xml	Removes the parent Maven configuration for the 2018fall semester
submit.csv files	Removes submission statistics for labs 5, 6, and 7

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.