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
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# REQ-012: portfolio 생성 CLI catalog 검증
- Status: Approved
- Type: Interface
- Priority: High
- Owner: Justin Ko
## Intent
- user가 `pfhub portfolio create` CLI로 portfolio를 생성할 때 지정한 asset이 catalog에 active 상태로 존재하는지 검증하여, 미등록 또는 비활성 asset 기반의 portfolio 생성을 방지한다.
## Requirement
- `pfhub portfolio create` 명령에 `--asset-id <uuid>` 또는 `--symbol <symbol>` 옵션을 추가하여 catalog asset을 지정하도록 한다.
- portfolio 생성 전 지정된 `asset_id`(또는 symbol로 조회한 asset_id)가 `assets` catalog에 `status='active'`로 존재하는지 검증한다.
- catalog에 없거나 `status='inactive'`인 asset이면 오류 메시지와 함께 생성을 거부한다.
- `app/services/portfolio_service.py`의 `create_portfolio`에 asset 검증 로직을 추가한다.
- user portfolio CRUD HTTP API(POST /portfolios 등)는 이 REQ 범위 밖이다(별도 Discovery에서 처리).
## Acceptance Criteria
1. Given active asset이 catalog에 존재, When `pfhub portfolio create <name> --asset-id <asset_id> --user <username>`, Then portfolio가 생성되고 해당 asset_id로 연결된다.
2. Given 존재하지 않는 asset_id, When `pfhub portfolio create` with 미등록 asset_id, Then "asset not found" 오류가 출력되고 portfolio가 생성되지 않는다.
3. Given `status='inactive'`인 asset_id, When `pfhub portfolio create` with 해당 asset_id, Then "asset is inactive" 오류가 출력되고 portfolio가 생성되지 않는다.
4. Given `--symbol <symbol>` 옵션 사용, When 해당 symbol이 catalog에 active로 존재, Then symbol로 asset_id를 조회하여 portfolio를 생성한다.
## Impacted Area
- Docs: 없음 (별도 문서 갱신 불필요)
- Modules:
- `app/cli/commands/portfolio.py` — create 명령에 `--asset-id` / `--symbol` 옵션 추가
- `app/services/portfolio_service.py` — create_portfolio에 catalog 검증 로직 추가
- Tests:
- `tests/test_asset_catalog.py` (신규) — catalog 검증 AC-1~4 검증
## Notes
- REQ-009(assets 테이블), REQ-011(portfolios 재설계) 선행 필요.
- HTTP API를 통한 portfolio 생성 시 catalog 검증 정책은 동일하게 적용되어야 하나, HTTP mutation API는 Out of Scope(별도 Discovery 처리 예정)이다.
- Source: dcy-001 FR-4
## 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 FR-4를 Interface REQ로 분리; portfolio create CLI catalog 검증 정의
#### Acceptance Criteria Delta
- Added:
- AC-1~4 최초 작성
#### Impacted Area Delta
- Docs:
- 없음
- Modules:
- app/cli/commands/portfolio.py, app/services/portfolio_service.py — 최초 지정
- Tests:
- tests/test_asset_catalog.py — 최초 지정
#### 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: confirm-req 후 batch 계획 편입; REQ-009, REQ-011 선행 의존성 확인
#### Validation Plan
- pytest CliRunner로 AC-1~4 검증