fix(api): revert auth/type regressions from standalone sync, keep email-in feature only

- Revert auth/dependencies.py to cookie+Bearer dual auth with str user IDs
- Add GET /auth/me/email-in-address endpoint for receipt email routing
- Update User model: add email_inbound_token, change id/store_id/user_id to str
- Update AuthService and UserResponse to use str user IDs
- Update route count test: 33 -> 34 routes
- Restore e2e test for email-in-address endpoint

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

src/cartsnitch_api/models/user.py

@@ -1,11 +1,10 @@
 """User and UserStoreAccount models."""
 
 import secrets
-import uuid
 from datetime import datetime
 from typing import TYPE_CHECKING
 
-from sqlalchemy import DateTime, ForeignKey, String, UniqueConstraint
+from sqlalchemy import DateTime, ForeignKey, String, Text, UniqueConstraint
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from cartsnitch_api.constants import AccountStatus
@@ -17,11 +16,12 @@ if TYPE_CHECKING:
     from cartsnitch_api.models.store import Store
 
 
-class User(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+class User(TimestampMixin, Base):
     """Application user."""
 
     __tablename__ = "users"
 
+    id: Mapped[str] = mapped_column(Text, primary_key=True)
     email: Mapped[str] = mapped_column(String(255), nullable=False, unique=True)
     hashed_password: Mapped[str] = mapped_column(String(255), nullable=False)
     display_name: Mapped[str | None] = mapped_column(String(100))
@@ -43,8 +43,8 @@ class UserStoreAccount(UUIDPrimaryKeyMixin, TimestampMixin, Base):
     __tablename__ = "user_store_accounts"
     __table_args__ = (UniqueConstraint("user_id", "store_id", name="uq_user_store_account"),)
 
-    user_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("users.id"), nullable=False)
-    store_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("stores.id"), nullable=False)
+    user_id: Mapped[str] = mapped_column(ForeignKey("users.id"), nullable=False)
+    store_id: Mapped[str] = mapped_column(ForeignKey("stores.id"), nullable=False)
     session_data: Mapped[dict | None] = mapped_column(EncryptedJSON)
     session_expires_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
     last_sync_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))