feat: merge cartsnitch/api into api/ subdirectory

Consolidate API gateway service into monorepo.
Squashed from https://github.com/cartsnitch/api main (89bacb1).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/cartsnitch_api/models/store.py

@@ -0,0 +1,52 @@
+"""Store and StoreLocation models."""
+
+import uuid
+from typing import TYPE_CHECKING
+
+from sqlalchemy import Float, ForeignKey, String
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from cartsnitch_api.constants import StoreSlug
+from cartsnitch_api.models.base import Base, TimestampMixin, UUIDPrimaryKeyMixin
+
+if TYPE_CHECKING:
+    from cartsnitch_api.models.coupon import Coupon
+    from cartsnitch_api.models.price import PriceHistory
+    from cartsnitch_api.models.purchase import Purchase
+    from cartsnitch_api.models.user import UserStoreAccount
+
+
+class Store(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    """Supported retailer."""
+
+    __tablename__ = "stores"
+
+    name: Mapped[str] = mapped_column(String(100), nullable=False)
+    slug: Mapped[StoreSlug] = mapped_column(String(20), nullable=False, unique=True)
+    logo_url: Mapped[str | None] = mapped_column(String(500))
+    website_url: Mapped[str | None] = mapped_column(String(500))
+
+    # Relationships
+    locations: Mapped[list["StoreLocation"]] = relationship(back_populates="store")
+    purchases: Mapped[list["Purchase"]] = relationship(back_populates="store")
+    user_accounts: Mapped[list["UserStoreAccount"]] = relationship(back_populates="store")
+    price_histories: Mapped[list["PriceHistory"]] = relationship(back_populates="store")
+    coupons: Mapped[list["Coupon"]] = relationship(back_populates="store")
+
+
+class StoreLocation(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    """Physical store location."""
+
+    __tablename__ = "store_locations"
+
+    store_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("stores.id"), nullable=False)
+    address: Mapped[str] = mapped_column(String(300), nullable=False)
+    city: Mapped[str] = mapped_column(String(100), nullable=False)
+    state: Mapped[str] = mapped_column(String(2), nullable=False)
+    zip: Mapped[str] = mapped_column(String(10), nullable=False)
+    lat: Mapped[float | None] = mapped_column(Float)
+    lng: Mapped[float | None] = mapped_column(Float)
+
+    # Relationships
+    store: Mapped["Store"] = relationship(back_populates="locations")
+    purchases: Mapped[list["Purchase"]] = relationship(back_populates="store_location")