feat: asset catalog API, 태그 DB 기초, 마이그레이션 3건 및 도메인/테스트 갱신 (2026-05-19)

app/domain/models.py

@@ -18,6 +18,16 @@ class MarketCode(str, Enum):
     BITHUMB = "BITHUMB"
 
 
+@dataclass
+class Tag:
+    tag_id: str
+    name: str
+    created_by_user_id: str
+    is_admin_tag: bool = False
+    is_active: bool = True
+    created_at: datetime | None = None
+
+
 @dataclass
 class Asset:
     asset_id: str
@@ -97,6 +107,7 @@ class Portfolio:
     symbol: str
     asset_id: str | None = None
     tags: list[str] | None = None
+    tag_ids: list[str] | None = None
     owner_user_id: str | None = None
     cash_balance: float = 0.0
     asset_quantity: float = 0.0