feat: add HTTP audit middleware

[gfyrag]

Summary

• Wire the go-libs audit middleware into the wallets HTTP router
• Add messaging infrastructure (publish flags + messagingfx module) for audit event publishing
• Captures request/response data and publishes audit events via Watermill

Depends on: formancehq/go-libs#604

Test plan

• Module compiles successfully
• CI passes

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 27571c74-7953-45ba-a3fa-18ce46b1029e

📥 Commits

Reviewing files that changed from the base of the PR and between 4192647 and 484fbfc.

⛔ Files ignored due to path filters (2)

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

📒 Files selected for processing (3)

• cmd/serve.go
• pkg/api/router.go
• pkg/api/utils_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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