Bootstrap Python project and add base domain model

src/mka/models/base.py

@@ -1,6 +1,6 @@
 """Shared base classes for the Meeting Assistant domain model."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from uuid import UUID, uuid4
 
 from pydantic import BaseModel, ConfigDict, Field
@@ -8,7 +8,7 @@ from pydantic import BaseModel, ConfigDict, Field
 
 def utc_now() -> datetime:
     """Return the current time as a timezone-aware UTC datetime."""
-    return datetime.now(timezone.utc)
+    return datetime.now(UTC)
 
 
 class DomainModel(BaseModel):
@@ -22,4 +22,4 @@ class DomainModel(BaseModel):
 
     id: UUID = Field(default_factory=uuid4)
     created_at: datetime = Field(default_factory=utc_now)
-    updated_at: datetime = Field(default_factory=utc_now)
+    updated_at: datetime = Field(default_factory=utc_now)