ci: restore Go 1.25 checks

[appleboy]

Summary

Align the Go test matrix with the Go 1.25 module requirement.

Related issues

• Jira: N/A
• GitHub: N/A

Architecture / flow

flowchart TD
    Trigger[Push or pull request] --> Matrix[Go 1.25 test matrix]
    Matrix --> Checks[Tests and lint]
    LintConfig[golangci-lint v2 configuration] --> Checks
    style Matrix fill:#dff0d8,stroke:#3c763d
    style LintConfig fill:#dff0d8,stroke:#3c763d

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AI authorship

• No AI was used
• AI was used
  • Tool / model: Codex (GPT-5)
  • AI-authored files: .github/workflows/go.yml
  • Human line-by-line reviewed: None — not yet reviewed by a human.

Change classification

• Leaf change
• Core change

Plan reference

Restore the failing Go CI workflows while preserving application behavior.

Verification

• Automated: golangci-lint run and go test -run "^$" ./... passed locally.
• Manual: GitHub Actions was triggered by the branch push.
• Not run: Full local integration tests require Docker; the local Docker daemon is unavailable.

Security check

• No secrets in the diff
• N/A - no external or security-sensitive interface changed

Risk and rollback

• Risk: CI now tests the Go version declared by go.mod instead of unsupported older versions.
• Rollback: Revert this PR.

Reviewer guide

• Read carefully: workflow matrix and golangci-lint migration.
• Spot-check: test-only string constants and documented local RabbitMQ credential suppression.

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