Improve bug report template to prevent placeholder submissions

[Copilot]

This PR addresses issue #1 which was a test submission filled with placeholder text like "dasdasdasd" and "xxxx" instead of meaningful bug report content.

Problem

The current Chinese bug report template (.github/ISSUE_TEMPLATE/bug_report_zh.yml) doesn't provide sufficient guidance to prevent users from submitting issues with placeholder text, leading to non-actionable reports that waste maintainer time.

Solution

Enhanced the issue template with:

• Explicit guidance against using placeholder text like "xxxx" in the description fields
• Helpful placeholder text that guides users on what specific information to provide
• Clearer expectations for meaningful bug reports

Changes Made

• Added warning text "请不要使用占位符文本如 'xxxx'" to problem description and expected result fields
• Added descriptive placeholder text like "请详细描述您遇到的具体问题..." to guide users
• Enhanced the additional information field with similar improvements

Technical Validation

• Verified YAML syntax remains valid
• Tested that the template structure is preserved
• Confirmed the repository builds successfully with no technical issues

This change will help ensure future bug reports contain actionable information rather than placeholder text, improving the quality of issue submissions.

Fixes #1.

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