Add PR/MR comment posting support for GitHub, GitLab, Gitea, and Gogs with official SDK integration#37

Draft

Copilot wants to merge 7 commits intomainfrom

Commits on Aug 2, 2025

Initial plan
Copilot
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Implement core comment posting functionality with GitHub, GitLab, and Gitea support

Copilot
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mach6
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Add comprehensive tests, documentation, and example configuration for comment posting

Copilot
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mach6
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Refactor Gitea implementation to use official SDK instead of manual HTTP calls

Copilot
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mach6
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Add dependencies for GitHub and GitLab official SDKs

Copilot
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mach6
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Refactor GitHub and GitLab implementations to use official Go SDKs

Copilot
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mach6
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Add Gogs support for PR comment posting

Copilot
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mach6
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