Refactor gitstatus.go to use go-github package

[Copilot]

This PR refactors the internal/apis/gitstatus.go file to use the official go-github package instead of custom HTTP handling and struct definitions.

Changes Made

Replaced Custom Implementation:

• Removed 89 lines of custom struct definitions (Actor, Repo, Author, Commit, Payload, Event)
• Replaced manual HTTP requests with go-github client methods
• Added OAuth2 token authentication for secure API access

Updated Functions:

• GetGitHubUser() - Now uses client.Users.Get()
• GetGitHubEvents() - Now uses client.Activity.ListEventsPerformedByUser()
• GetGitHubCommits() - Updated to work with go-github event structures

Enhanced Error Handling:

• Added proper nil-safety checks for all pointer fields
• Improved error messages and handling
• Maintained identical output format for backward compatibility

Dependencies Added

• github.com/google/go-github/v57 v57.0.0 - Official GitHub API client
• golang.org/x/oauth2 v0.30.0 - OAuth2 authentication

Testing

• All existing tests updated and passing (4/4 GitHub-related tests)
• Added comprehensive test coverage for edge cases
• Verified output format remains exactly the same
• Build system works correctly with new dependencies

The refactoring reduces code complexity while leveraging a robust, well-maintained library for GitHub API interactions.

Fixes #4.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• icanhazdadjoke.com
  • Triggering command: /tmp/go-build4182161886/b375/apis.test -test.testlogfile=/tmp/go-build4182161886/b375/testlog.txt -test.paniconexit0 -test.timeout=10m0s (dns block)
  • Triggering command: /tmp/go-build4041625317/b001/apis.test -test.testlogfile=/tmp/go-build4041625317/b001/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true (dns block)
  • Triggering command: /tmp/go-build1478738131/b379/apis.test -test.testlogfile=/tmp/go-build1478738131/b379/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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