docs(dcy/srs): add DCY-001 discovery and REQ-001/002/003 requirements

Introduces discovery for real DB migration validation and operations readiness:
- dcy-001_20260430_real-db-migration-validation-and-operations-readiness.md
- REQ-001: Local DB validation scenarios (Testing)
- REQ-002: Alembic runtime schema ownership (Migration)
- REQ-003: Local DB operations runbook and baseline updates (Documentation)

Updates discovery and SRS indexes to include new documents.

docs/srs/index.md

@@ -74,14 +74,21 @@
 
 ## Next Requirement ID
 
-- Current: `REQ-001`
+- Current: `REQ-004`
 - Rule: `Requirement Register`에 있는 가장 큰 REQ 번호보다 정확히 1 커야 한다.
 
 ## Requirement Register
 
 | ID | Title | Type | Status | Priority | Owner | Link |
 | --- | --- | --- | --- | --- | --- | --- |
+| REQ-001 | 로컬 DB 초기화 및 마이그레이션 검증 시나리오 정의 | Testing | Approved | High | repository-maintainers | [REQ-001](./Testing/req-001_local-db-validation-scenarios.md) |
+| REQ-002 | Alembic와 runtime schema ownership 경계 정리 | Migration | Approved | High | repository-maintainers | [REQ-002](./Migration/req-002_alembic-runtime-schema-ownership.md) |
+| REQ-003 | 로컬 DB 운영 runbook 및 baseline 문서 갱신 | Documentation | Approved | Medium | repository-maintainers | [REQ-003](./Documentation/req-003_local-db-operations-runbook-and-baseline-updates.md) |
 
 ## Recent Change Log Summary
 
-- 없음
+- 2026-04-30: REQ-003 Approved 전환 — 로컬 DB 운영 runbook 및 baseline 문서 갱신
+- 2026-04-30: REQ-002 Approved 전환 — Alembic와 runtime schema ownership 경계 정리
+- 2026-04-30: REQ-001 Approved 전환 — 로컬 DB 초기화 및 마이그레이션 검증 시나리오 정의
+- 2026-04-30: REQ-003 Proposed 생성 — 로컬 DB 운영 runbook 및 baseline 문서 갱신 (source Discovery: dcy-001)
+- 2026-04-30: REQ-002 Proposed 생성 — Alembic와 runtime schema ownership 경계 정리 (source Discovery: dcy-001)