[CSM Portal][BE] Add POST /security-report-analyses/search and POST /engagements/search endpoints

[Rashmika998]

Summary

• Adds POST /security-report-analyses/search BFF endpoint, proxying the entity service (PR [Customer Entity] Add POST /security-report-analyses/search endpoint #906)
• Adds POST /engagements/search BFF endpoint, proxying the entity service (PR [Customer Entity] Add POST /engagements/search endpoint #908)
• Both endpoints follow the standard handler pattern: auth check → body read/validate → entity client → mapUpstreamError on failure → passthrough JSON response
• OpenAPI spec updated with full request/response schemas for both endpoints (filters, sortBy, pagination, view types)

Test plan

• POST /security-report-analyses/search returns 200 with valid payload (ServiceNow data source)
• POST /engagements/search returns 200 with valid payload (ServiceNow data source)
• Both endpoints return 401 when called without a valid JWT
• Both endpoints return 503 when Postgres data source is active
• Both endpoints return 400 on invalid JSON body
• All existing backend tests still pass (make test)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 412c6d4e-0afd-4d13-bdb5-110c5697874b

📥 Commits

Reviewing files that changed from the base of the PR and between 5223ab4 and a9f2a02.

📒 Files selected for processing (5)

• apps/csm-portal/backend/cmd/server/main.go
• apps/csm-portal/backend/internal/entity/entity.go
• apps/csm-portal/backend/internal/handler/cases.go
• apps/csm-portal/backend/internal/handler/helpers_test.go
• apps/csm-portal/backend/openapi.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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