refactor: replace support MCP tools with create_issue, add_comment, search_issues

[devin-ai-integration]

refactor: replace support MCP tools with create_issue, add_comment, search_issues

Summary

Replaces the three existing support MCP tools (submit_bug_report, submit_feature_request, read_github_data) with a cleaner set focused on issue management:

• create_issue — creates a GitHub issue with title, body, and optional labels
• add_comment — adds a comment to an existing issue by number
• search_issues — searches GitHub issues via the search API with optional state filter

Key changes in github.rs: create_issue and add_issue_comment are now pub(crate), add_issue_comment returns the comment URL instead of (), and a new search_issues function uses octocrab's search API.

The old read_github_data tool (which queried an Airbyte-synced Postgres DB) is removed in favor of live GitHub search. The old submit_bug_report/submit_feature_request functions are preserved for the HTTP /submit route but no longer exposed as MCP tools.

Review & Testing Checklist for Human

• search_issues only searches fastrepl/hyprnote — the GITHUB_OWNER/GITHUB_REPO constants are hardcoded. Verify this is sufficient or if fastrepl/homebrew-hyprnote should also be searchable.
• add_issue_comment return type change — changed from Result<()> to Result<String>. The only existing caller (attach_log_analysis) discards the result with let _ =, so should be safe. Verify no other callers exist.
• IssueState serialization — uses format!("{:?}", issue.state).to_lowercase() since IssueState doesn't impl Display. This produces "open"/"closed" based on Debug output — confirm this is stable across octocrab versions.
• Test the MCP tools end-to-end against the deployed support service to verify create_issue, add_comment, and search_issues work with the GitHub App credentials.

Notes

• The db_pool field on AppState is no longer used by MCP tools (only by the HTTP route), which produces a dead-code warning. This is pre-existing — no new warnings introduced.
• Feature requests no longer get a dedicated Discussion-creation tool; they go through create_issue like bugs.

Link to Devin run: https://app.devin.ai/sessions/bf96a1ec4c42434191e95bbe936db944
Requested by: @yujonglee

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[devin-ai-integration]

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[devin-ai-integration]

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