feat: implement portfolio UUID migration and v1 API finalization (BAT-006, BAT-001 re-verified)

Core Changes:
- Migrate portfolio_id from string to UUID in schema and repository layer
- Update portfolio CLI commands to use name+user combination for identification
- Update HTTP API to accept portfolio_id as UUID path parameter
- Implement portfolio ownership validation in repository queries

Requirements Completed (REQ-016 to REQ-019):
- REQ-016: portfolios table UUID schema migration with data migration script
- REQ-017: CLI portfolio commands with name+user identification
- REQ-018: HTTP API portfolio path parameters and v1 asset_id UUID returns
- REQ-019: Portfolio UUID baseline documentation updates

BAT-001 Re-verification:
- REQ-004~010 marked as Implemented after verification evidence validation
- All v1 API endpoints verified with comprehensive test coverage

Documentation Updates:
- Update data-model.md with portfolio UUID structure
- Update interface-contract.md with UUID path parameters
- Update runtime-flows.md with ownership-based resolution flows
- Update project-structure.md with database layer changes
- Add migration script for portfolio UUID transition

Testing:
- Add test_portfolio_uuid.py for migration validation
- Update test_cli.py and test_portfolio_ownership.py for ownership checks

docs/batches/bat-008_20260511_trex-basic-baseline-docs-update/index.md

@@ -0,0 +1,41 @@
+# BAT-008 Index
+
+- Status: release-candidate
+- Batch: BAT-008
+- Profile: batch-lite
+- Created: 2026-05-11
+
+## Included REQ
+
+| REQ | 제목 | Type | Priority |
+|-----|------|------|----------|
+| REQ-011 | trex-basic 계약 반영을 위한 baseline 문서 갱신 | Documentation | Medium |
+
+## Source Discovery
+
+- [dcy-002](../../discovery/) (trex-basic v1 API contract — FR/NFR 구현 완료 후 documentation closure)
+
+## Scope Summary
+
+- docs/interface-contract.md: GET /health, GET /v1/assets, GET /v1/user_info, POST /v1/assets/{asset_id}/ledger/trades 엔드포인트 명세 및 service-token bearer 인증 방식 추가 (REQ-011 AC-1)
+- docs/data-model.md: broker_credentials, ledger_trades 테이블, portfolios.market, auth_tokens.runtime_id 컬럼 추가 (REQ-011 AC-2)
+- docs/runtime-flows.md: v1 API 처리 흐름, runtime_id 발급 흐름 추가 (REQ-011 AC-3)
+- 신규 코드/모듈/스키마 변경 없음 — 구현 완료(REQ-004~010 Implemented) 후 문서 동기화
+
+## Impacted Area
+
+- Docs:
+  - `docs/interface-contract.md` — v1 API 엔드포인트 명세, service-token 인증 방식 추가
+  - `docs/data-model.md` — broker_credentials, ledger_trades 테이블 및 컬럼 추가
+  - `docs/runtime-flows.md` — v1 API 처리 흐름 및 runtime_id 발급 흐름 추가
+- Modules: 없음
+- Tests: 없음
+
+## Stage Documents
+
+| Stage | File | Status |
+|-------|------|--------|
+| Planning | [planning.md](./planning.md) | confirmed |
+| Design | [design.md](./design.md) | confirmed |
+| Implementation | [implementation.md](./implementation.md) | completed |
+| Verification | [verification.md](./verification.md) | passed |