feat: 태그 HTTP API(BAT-004) 및 pfhub tag CLI + baseline 문서 갱신(BAT-005)

BAT-004 (REQ-004, REQ-005):
- app/api/v1_tags.py: POST /v1/tags, GET /v1/tags, PATCH /v1/tags/{id}/deactivate
- app/api/v1_portfolios.py: POST/DELETE /v1/portfolios/{id}/tags
- app/api/v1_assets.py: POST/DELETE /v1/assets/{id}/tags 엔드포인트 추가
- app/schemas/v1.py: TagItem, TagCreateRequest, TagListResponse, TagApplyRequest/Response 추가
- app/repositories/portfolio_repository.py, postgres.py: append/remove_portfolio_tag_id 추가
- app/main.py: v1_portfolios_router, v1_tags_router 등록
- tests/test_tags_http_api.py: 22개 HTTP API 테스트

BAT-005 (REQ-007, REQ-008):
- app/cli/commands/tag.py: pfhub tag create/list/deactivate/apply/remove 7개 커맨드 신규
- app/cli/main.py: tag_app 등록
- app/cli/commands/portfolio.py: pfhub portfolio tag add/list/remove 완전 제거(breaking change)
- app/cli/core/utils.py: print_tag_table + list[Tag] render 분기 추가
- tests/test_tags_cli.py: REQ-007 AC-1~9 커버 24개 CLI 테스트 신규
- tests/test_cli.py: 제거된 portfolio tag 테스트 2개 삭제
- docs/data-model.md, interface-contract.md, project-structure.md, runtime-flows.md: 태그 모델 baseline 갱신(REQ-008)
- docs/batches/: BAT-004, BAT-005 전체 산출물(release-candidate)

247 passed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/repositories/postgres.py

@@ -1718,6 +1718,36 @@ class PostgresPortfolioRepository:
                 raise ValueError(f"태그를 찾을 수 없습니다: {tag_id}")
         return self._row_to_tag(row)
 
+    def append_portfolio_tag_id(self, portfolio_id: str, tag_id: str) -> None:
+        self.ensure_schema()
+        with self._connect().cursor() as cur:
+            cur.execute(
+                """
+                UPDATE portfolios
+                SET tag_ids = array_append(tag_ids, %s::uuid)
+                WHERE portfolio_id = %s AND NOT (%s::uuid = ANY(tag_ids))
+                """,
+                (tag_id, portfolio_id, tag_id),
+            )
+            if cur.rowcount == 0:
+                cur.execute("SELECT portfolio_id FROM portfolios WHERE portfolio_id = %s", (portfolio_id,))
+                if cur.fetchone() is None:
+                    raise ValueError(f"portfolio를 찾을 수 없습니다: {portfolio_id}")
+
+    def remove_portfolio_tag_id(self, portfolio_id: str, tag_id: str) -> None:
+        self.ensure_schema()
+        with self._connect().cursor() as cur:
+            cur.execute(
+                """
+                UPDATE portfolios
+                SET tag_ids = array_remove(tag_ids, %s::uuid)
+                WHERE portfolio_id = %s
+                """,
+                (tag_id, portfolio_id),
+            )
+            if cur.rowcount == 0:
+                raise ValueError(f"portfolio를 찾을 수 없습니다: {portfolio_id}")
+
     def rotate_service_token(self, name: str) -> tuple[str, AuthToken]:
         from app.core.security import generate_token, hash_token, token_prefix as _token_prefix