Resolve linter contradictions: consolidate config, fix isort first-party, pylint 10/10

Agent-Logs-Url: https://github.com/christianlouis/dmarq/sessions/1e4a1f06-55b9-4040-853e-6aaf9ee574c8

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

backend/app/models/domain.py

@@ -1,9 +1,10 @@
 from datetime import datetime
 
-from app.core.database import Base
 from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Index, Integer, String, Text
 from sqlalchemy.orm import relationship
 
+from app.core.database import Base
+
 
 class Domain(Base):
     """Domain model representing a monitored domain"""

backend/app/models/report.py

@@ -1,9 +1,10 @@
 from datetime import datetime
 
-from app.core.database import Base
 from sqlalchemy import Column, DateTime, ForeignKey, Index, Integer, String, Text
 from sqlalchemy.orm import relationship
 
+from app.core.database import Base
+
 
 class DMARCReport(Base):
     """DMARC Aggregate Report model"""

backend/app/models/user.py

@@ -1,7 +1,8 @@
-from app.core.database import Base
 from sqlalchemy import Boolean, Column, Integer, String
 from sqlalchemy.orm import relationship
 
+from app.core.database import Base
+
 
 class User(Base):
     """User model"""