chore(backend): standardize multiline formatting across modules

Reformatted multiline function calls, object definitions, and queries for improved code readability and consistency. Adjusted imports and constraints where necessary.

backend/app/models/syndarix/sprint.py

@@ -5,7 +5,17 @@ Sprint model for Syndarix AI consulting platform.
 A Sprint represents a time-boxed iteration for organizing and delivering work.
 """
 
-from sqlalchemy import Column, Date, Enum, ForeignKey, Index, Integer, String, Text, UniqueConstraint
+from sqlalchemy import (
+    Column,
+    Date,
+    Enum,
+    ForeignKey,
+    Index,
+    Integer,
+    String,
+    Text,
+    UniqueConstraint,
+)
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import relationship