feat: update solutions to lc problem: No.2958

[yanglbme]

Summary

• Update solutions for No.2958 Length of Longest Subarray With at Most K Frequency: rewrite implementations (Python/Java/C++/Go/TypeScript) with cleaner two-pointer naming (l/r) and add a new Rust solution
• Sync README.md and README_EN.md code blocks, add Rust tab, and update the Chinese/English solution descriptions to match the new implementations

Test plan

• Format all sources (black / clang-format / gofmt / prettier / rustfmt)
• lint-staged pre-commit hooks pass
• CI checks pass

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[Copilot]

Pull request overview

This PR updates the multi-language solution set for LeetCode #2958 (“Length of Longest Subarray With at Most K Frequency”) by standardizing the sliding-window/two-pointer implementations (using l/r naming) and adding a new Rust solution, while keeping the Chinese/English READMEs in sync with the updated code.

Changes:

• Rewrote existing Python/Java/C++/Go/TypeScript solutions with consistent l/r two-pointer naming.
• Added a new Rust implementation (Solution.rs) using the same sliding-window approach.
• Updated README.md and README_EN.md to sync code blocks/descriptions and add a Rust tab.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
solution/2900-2999/2958.Length of Longest Subarray With at Most K Frequency/Solution.ts	Refactors TypeScript sliding-window variables to l/r and uses while for shrink logic.
solution/2900-2999/2958.Length of Longest Subarray With at Most K Frequency/Solution.rs	Adds Rust sliding-window solution using HashMap frequency counts.
solution/2900-2999/2958.Length of Longest Subarray With at Most K Frequency/Solution.py	Refactors Python two-pointer implementation to l/r naming.
solution/2900-2999/2958.Length of Longest Subarray With at Most K Frequency/Solution.java	Refactors Java two-pointer implementation to l/r naming.
solution/2900-2999/2958.Length of Longest Subarray With at Most K Frequency/Solution.go	Refactors Go two-pointer implementation to l/r naming and minor map init cleanup.
solution/2900-2999/2958.Length of Longest Subarray With at Most K Frequency/Solution.cpp	Refactors C++ two-pointer implementation to l/r naming.
solution/2900-2999/2958.Length of Longest Subarray With at Most K Frequency/README.md	Updates CN explanation/code blocks to match refactors; adds Rust snippet/tab.
solution/2900-2999/2958.Length of Longest Subarray With at Most K Frequency/README_EN.md	Updates EN explanation/code blocks to match refactors; adds Rust snippet/tab.

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