chore: add .cursor and .qoder to .gitignore

[ChenYi015]

Purpose of this PR

This PR adds .cursor/ and .qoder/ directories to the .gitignore file to ignore IDE-specific files and directories that should not be committed to version control.

Proposed changes:

• Add .cursor/ directory to IDE files section in .gitignore.
• Add .qoder/ directory to IDE files section in .gitignore.

Change Category

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Rationale

These IDE-specific directories contain user settings, workspace configurations, and AI assistant context that are specific to individual developers' environments and should not be committed to the repository. Adding them to .gitignore helps prevent accidental commits of personal development settings.

[google-oss-prow]

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