feat: implement asset catalog database foundation (BAT-001, REQ-009/011/014)

Asset Catalog Model Implementation (BAT-001):
- Introduce assets table with UUID PK, symbol UNIQUE, markets TEXT[] array
- Define MarketCode enum (KRX, NXT, SOR, NASDAQ, NYSE, UPBIT, BITHUMB)
- Add Asset domain model with catalog properties
- Implement asset CRUD protocols in portfolio_repository
- Add PostgreSQL asset CRUD operations with GIN index on markets

Portfolio Model Refactoring (REQ-011):
- Add portfolios.asset_id UUID FK to assets(asset_id) ON DELETE RESTRICT
- Remove portfolios.symbol and portfolios.market columns
- Update Portfolio domain model to reference asset_id instead of symbol/market
- Refactor all portfolio queries to JOIN assets catalog
- Update all repository methods to use asset references

Data Migration (REQ-014):
- Create 20260519_0017 Alembic revision for assets table creation
- Create 20260519_0018 Alembic revision for atomic data migration:
  * Extract unique symbol combinations from portfolios
  * Aggregate markets using ARRAY_AGG(DISTINCT market)
  * Populate assets catalog with extracted data
  * Update portfolios.asset_id to reference new assets
  * Remove legacy symbol/market columns in single transaction
- Implement migration with rollback support

Requirements Approved (REQ-001~008):
- REQ-001~008 transitioned from Proposed to Approved
- Complete tag model requirement set with implementation readiness

New Requirements Approved (REQ-009~015):
- REQ-009: assets table schema (approved, included in BAT-001)
- REQ-010: admin asset catalog CRUD (approved, future BAT-002)
- REQ-011: portfolios asset_id FK (approved, included in BAT-001)
- REQ-012: portfolio create catalog validation (approved, future BAT-002)
- REQ-013: GET /v1/assets token branching (approved, future BAT-002)
- REQ-014: portfolios data migration (approved, included in BAT-001)
- REQ-015: asset catalog baseline docs (approved)

Code Changes:
- app/domain/models.py: Add Asset model, MarketCode enum, Portfolio asset_id FK
- app/repositories/portfolio_repository.py: Define asset CRUD protocol
- app/repositories/postgres.py: Implement asset operations with full CRUD
- app/api/v1_assets.py: Remove symbol/market direct references
- app/cli/commands/portfolio.py: Update portfolio commands for asset references
- app/schemas/portfolio.py: Update portfolio schema with asset_id
- All portfolio operations throughout codebase: Use asset references

Testing:
- Add test_asset_catalog.py for asset CRUD operations
- Verify REQ-009 AC-1~5 (asset catalog creation, lookup, uniqueness)
- Verify REQ-011 AC-1~5 (FK constraint, portfolio asset reference)
- Verify REQ-014 AC-1~6 (migration atomicity, data correctness, rollback)
- Update existing tests for asset model usage

Documentation:
- Create BAT-001 batch documents (planning, design, implementation, verification)
- Update dcy-001 with implementation details and confirmed architecture
- Add 8 new requirement documents (REQ-009~015)
- Update docs/discovery/index.md with batch entry

Impact:
- Database: assets catalog table, portfolios refactored to reference assets
- Migration: 2 new Alembic revisions (0017 assets, 0018 portfolio migration)
- API: Symbol/market now accessed through asset references
- CLI: Portfolio commands require asset reference pattern
- All existing portfolio data preserved and correctly migrated

docs/srs/Documentation/req-008_tag-baseline-docs-update.md

@@ -1,6 +1,6 @@
 # REQ-008: 태그 모델 도입 baseline 문서 갱신
 
-- Status: Proposed
+- Status: Approved
 - Type: Documentation
 - Priority: Low
 - Owner: Justin Ko
@@ -38,6 +38,34 @@
 
 ## Change Log
 
+### CHG-20260519-02
+- Date: 2026-05-19
+- Author: Justin Ko
+
+#### Change Summary
+- Status: Proposed → Approved
+
+#### Intent
+- 승인 게이트 통과: 필수 필드(Status/Type/Priority/Owner/Intent/Requirement/AC/Impacted Area/Change Log) 모두 충족, AC 구체성 확인 완료
+
+#### Acceptance Criteria Delta
+- No change
+
+#### Impacted Area Delta
+- No change
+
+#### Delivery Trace Delta
+- Batches:
+  - none (미정)
+- Releases:
+  - none (미정)
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: promote-to-approved
+- Follow-up Action: batch 계획 편입
+
 ### CHG-20260519-01
 - Date: 2026-05-19
 - Author: Justin Ko

docs/srs/Documentation/req-015_asset-catalog-baseline-docs-update.md

@@ -0,0 +1,103 @@
+# REQ-015: asset catalog 도입 baseline 문서 갱신
+
+- Status: Approved
+- Type: Documentation
+- Priority: Low
+- Owner: Justin Ko
+
+## Intent
+- dcy-001에서 정의한 assets 테이블, portfolios 재설계, admin CRUD API/CLI, GET /v1/assets 토큰 분기 변경 내용을 baseline 문서에 반영하여 다음 Discovery/REQ 작성 시 잘못된 baseline 참조를 방지한다.
+
+## Requirement
+- `docs/data-model.md`에 `assets` 엔티티(asset_id, symbol, markets, display_name, status, created_at, updated_at)를 추가하고 `portfolios` 엔티티에서 symbol/market 제거 및 asset_id FK 참조를 반영한다.
+- `docs/interface-contract.md`에 `POST /v1/assets`, `PATCH /v1/assets/{asset_id}`, `PATCH /v1/assets/{asset_id}/deactivate` 엔드포인트 명세를 추가하고 `GET /v1/assets`의 토큰 타입별 분기 동작을 갱신한다.
+- `docs/runtime-flows.md`의 "Flow: v1 API — GET /v1/assets" 섹션을 service-token-only에서 토큰 타입 분기 구조로 교체하고, admin asset CRUD HTTP 흐름을 신규 추가한다.
+- `docs/project-structure.md`의 `app/cli/` Command groups 목록에 `asset` 커맨드 그룹을 추가하고, `app/api/` v1 route surfaces에 admin asset CRUD 엔드포인트를 반영한다.
+
+## Acceptance Criteria
+1. Given 구현 완료 후, When `docs/data-model.md`를 검토, Then `assets` 테이블 스키마(asset_id, symbol UNIQUE, markets TEXT[], display_name, status)와 `portfolios`의 asset_id FK 참조, symbol/market 제거가 반영되어 있다.
+2. Given 구현 완료 후, When `docs/interface-contract.md`를 검토, Then `POST/PATCH /v1/assets` 및 `PATCH /v1/assets/{id}/deactivate` 엔드포인트 명세, GET /v1/assets 토큰 타입별 분기 동작이 포함되어 있다.
+3. Given 구현 완료 후, When `docs/runtime-flows.md`를 검토, Then "GET /v1/assets" 플로우가 토큰 타입 분기 구조(service/user/admin)로 갱신되어 있고 admin asset CRUD 흐름이 추가되어 있다.
+4. Given 구현 완료 후, When `docs/project-structure.md`를 검토, Then `app/cli/` Command groups에 `asset`이 포함되고 `app/api/` v1 route surfaces에 admin asset CRUD 엔드포인트가 반영되어 있다.
+
+## Impacted Area
+- Docs:
+  - `docs/data-model.md`
+  - `docs/interface-contract.md`
+  - `docs/runtime-flows.md`
+  - `docs/project-structure.md`
+- Modules: 없음 (문서 전용)
+- Tests: 없음 (문서 검토로 확인)
+
+## Notes
+- 이 REQ는 REQ-009~014 구현 완료 후 마지막으로 수행한다.
+- `docs/runtime-flows.md` Update Triggers: "새 top-level runtime 또는 domain 모듈이 추가되었을 때" — asset CLI 그룹 추가, GET /v1/assets 토큰 분기 재정의 모두 해당.
+- `docs/project-structure.md` Update Triggers: "새 top-level runtime 또는 domain 모듈이 추가되었을 때" — `app/cli/commands/asset.py` 신규 추가 해당.
+- Source: dcy-001 In Scope(baseline 문서 갱신)
+
+## Change Log
+
+### CHG-20260519-02
+- Date: 2026-05-19
+- Author: Justin Ko
+
+#### Change Summary
+- Status: Proposed → Approved
+
+#### Intent
+- 승인 게이트 통과: 필수 필드(Status/Type/Priority/Owner/Intent/Requirement/AC/Impacted Area/Change Log) 모두 충족, AC 구체성 확인 완료
+
+#### Acceptance Criteria Delta
+- No change
+
+#### Impacted Area Delta
+- No change
+
+#### Delivery Trace Delta
+- Batches:
+  - none (미정)
+- Releases:
+  - none (미정)
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: promote-to-approved
+- Follow-up Action: batch 계획 편입
+
+### CHG-20260519-01
+- Date: 2026-05-19
+- Author: Justin Ko
+
+#### Change Summary
+- 최초 생성 — dcy-001 confirm-discovery 후 draft-req 실행
+
+#### Intent
+- dcy-001 구현 범위의 baseline 문서 갱신 요구를 Documentation REQ로 분리
+
+#### Acceptance Criteria Delta
+- Added:
+  - AC-1~4 최초 작성
+
+#### Impacted Area Delta
+- Docs:
+  - docs/data-model.md, docs/interface-contract.md, docs/runtime-flows.md, docs/project-structure.md — 최초 지정
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - none (미정)
+- Releases:
+  - none (미정)
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: REQ-009~014 구현 완료 후 일괄 반영
+
+#### Validation Plan
+- 각 대상 문서를 직접 검토하여 AC-1~4 기술 내용 포함 여부 확인