test(api): inject resolveAccount into buildReshapeHandler (closes #192)

[cristim]

Summary

• Adds resolveAccount func(context.Context) (string, error) as a 4th parameter to buildReshapeHandler (test helper only), with nil defaulting to the unscoped ("", nil) resolver.
• Updates the three unscoped callers to pass nil.
• Replaces the post-construction field override in TestReshapeRecommendations_Integration_ScopedAccount_FiltersToAccount with an inline constructor argument, making the scoped intent explicit and impossible to accidentally forget in future copy-pastes.

Test plan

• go build ./... passes (verified locally)
• grep -n "h.reshapeAccountResolver = " internal/api/handler_ri_exchange_integration_test.go returns zero results
• Integration tests pass: go test -tags=integration ./internal/api/... (requires Docker / testcontainers)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: c5f5add7-e01c-475a-979b-4c4d72223810

📥 Commits

Reviewing files that changed from the base of the PR and between 4956d66 and 928d2e5.

📒 Files selected for processing (1)

• internal/api/handler_ri_exchange_integration_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/192-wave18

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[cristim]

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