feat: add audit middleware to webhooks server

[gfyrag]

Summary

• Wire httpaudit.Middleware from go-libs/v5 into the webhooks HTTP handler to capture and publish audit events
• Add publish.FXModuleFromFlags to the serve command's fx options to provide a message.Publisher in the DI container
• Pass the publisher through the fx wiring in module.go and into newServerHandler() in handler.go

These audit commits were lost when the upgrade PR was squash-merged.

Test plan

• Verify the webhooks server starts correctly with the audit middleware enabled
• Confirm audit events are published to the audit-events topic when HTTP requests are made
• Ensure the worker mode still functions correctly (publish module was already wired there)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b30176fd-74a0-461d-904f-b904a5788b3f

📥 Commits

Reviewing files that changed from the base of the PR and between e22e7f7 and ab476ad.

⛔ Files ignored due to path filters (2)

• go.mod is excluded by !**/*.mod
• go.sum is excluded by !**/*.sum, !**/*.sum

📒 Files selected for processing (4)

• cmd/serve.go
• pkg/server/handler.go
• pkg/server/module.go
• pkg/worker/module.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/audit-middleware

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