docs(schema): document recommendations cloud_account_id filter semantics + add tests

[cristim]

Summary

• Adds inline comment tables at the two code sites implementing the account_ids → cloud_account_id SQL filter, documenting all five filter cases from the issue docs(schema): document recommendations cloud_account_id filter semantics + add tests #211 acceptance criteria.
• Adds TestGetRecommendations_AccountIDFilter (6 subtests) in handler_recommendations_test.go to pin each case end-to-end.
• No production logic changed.

Quirk surfaced

The fifth case (disabled-account exclusion) is enforced by the session-layer filterRecommendationsByAllowedAccounts after the SQL filter, not by SQL. The comment tables document this explicitly.

Test plan

• go test ./internal/api/... -run TestGetRecommendations_AccountIDFilter -v — 7 subtests pass
• go test ./internal/api/... -count=1 — 1016 tests pass
• go test ./internal/config/... -count=1 — 476 tests pass

Closes #211

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 980ea4e5-fc52-4805-8822-f031147083d4

📥 Commits

Reviewing files that changed from the base of the PR and between c84fd02 and e0ecad6.

📒 Files selected for processing (3)

• internal/api/handler_recommendations.go
• internal/api/handler_recommendations_test.go
• internal/config/store_postgres_recommendations.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/issue-211-cloud-account-id-filter

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[cristim]

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