Add create-pr Claude Code skill

[Kyome22]

Context of Contribution

• Bug Fix
• Refactoring
• New Feature
• Others

Summary of the Proposal

Adds a /create-pr Claude Code skill that guides the AI through creating a GitHub Pull Request following the RunCat365 PR template. The skill covers gathering branch info, classifying the change type, drafting the PR body in English, confirming with the user, and submitting the PR.

Reason for the new feature

N/A

Checklist

• This PR does not contain commits of multiple contexts.
• Code follows proper indentation and naming conventions.
• Implemented using only APIs that can be submitted to the Microsoft Store.
• Works correctly in both dark theme and light theme.
• Works correctly on any device.

[Copilot]

Pull request overview

Adds a new Claude Code skill (/create-pr) to guide users through drafting and submitting GitHub pull requests for RunCat365 using the repository PR template.

Changes:

• Introduce a new .claude/skills/create-pr/SKILL.md skill with a step-by-step PR creation workflow.
• Include guidance for classifying PR type, generating an English PR body, confirming with the user, and creating the PR via GitHub CLI.

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