feat: add solutions to lc problems: No.4006~4008

[yanglbme]

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Pull request overview

This PR adds multi-language solution implementations and full write-ups for LeetCode problems 4006–4008 to the doocs/leetcode solutions collection.

Changes:

• Added solution implementations for problems 4006, 4007, and 4008 in Python / Java / C++ / Go / TypeScript.
• Expanded both Chinese and English READMEs with explanations and language tabs for the new solutions.
• Included TypeScript code snippets in the README tabs for each problem.

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
solution/4000-4099/4008.Minimum Initial Strength to Defeat All Monsters/Solution.ts	Adds TypeScript implementation (difference array + binary search).
solution/4000-4099/4008.Minimum Initial Strength to Defeat All Monsters/Solution.py	Adds Python implementation (difference array + binary search).
solution/4000-4099/4008.Minimum Initial Strength to Defeat All Monsters/Solution.java	Adds Java implementation (difference array + binary search).
solution/4000-4099/4008.Minimum Initial Strength to Defeat All Monsters/Solution.go	Adds Go implementation (difference array + binary search).
solution/4000-4099/4008.Minimum Initial Strength to Defeat All Monsters/Solution.cpp	Adds C++ implementation (difference array + binary search).
solution/4000-4099/4008.Minimum Initial Strength to Defeat All Monsters/README.md	Adds Chinese explanation and code tabs for solutions.
solution/4000-4099/4008.Minimum Initial Strength to Defeat All Monsters/README_EN.md	Adds English explanation and code tabs for solutions.
solution/4000-4099/4007.Widest Possible Fence/Solution.ts	Adds TypeScript implementation (counting + enumeration).
solution/4000-4099/4007.Widest Possible Fence/Solution.py	Adds Python implementation (counting + enumeration).
solution/4000-4099/4007.Widest Possible Fence/Solution.java	Adds Java implementation (counting + enumeration).
solution/4000-4099/4007.Widest Possible Fence/Solution.go	Adds Go implementation (counting + enumeration).
solution/4000-4099/4007.Widest Possible Fence/Solution.cpp	Adds C++ implementation (counting + enumeration).
solution/4000-4099/4007.Widest Possible Fence/README.md	Adds Chinese explanation and code tabs for solutions.
solution/4000-4099/4007.Widest Possible Fence/README_EN.md	Adds English explanation and code tabs for solutions.
solution/4000-4099/4006.Count Valid Prefixes/Solution.ts	Adds TypeScript implementation (prefix balance counting).
solution/4000-4099/4006.Count Valid Prefixes/Solution.py	Adds Python implementation (prefix balance counting).
solution/4000-4099/4006.Count Valid Prefixes/Solution.java	Adds Java implementation (prefix balance counting).
solution/4000-4099/4006.Count Valid Prefixes/Solution.go	Adds Go implementation (prefix balance counting).
solution/4000-4099/4006.Count Valid Prefixes/Solution.cpp	Adds C++ implementation (prefix balance counting).
solution/4000-4099/4006.Count Valid Prefixes/README.md	Adds Chinese explanation and code tabs for solutions.
solution/4000-4099/4006.Count Valid Prefixes/README_EN.md	Adds English explanation and code tabs for solutions.

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