refactor(schemas): update contact import path and clean up __init__.py to resolve circular import error

schemas/__init__.py

@@ -1,9 +1,7 @@
 from schemas.tiers.tiers import (TiersDetails,)
 from schemas.tiers.type_tiers import (TypeTiers,)
-from schemas.tiers.contact import (Contact,)
 
 __all__ = [
     "TiersDetails",
-    "Contact",
     "TypeTiers",
 ]

schemas/tiers/tiers.py

@@ -1,6 +1,6 @@
 from typing import List, Optional
 from pydantic import BaseModel, Field
-from schemas import Contact
+from schemas.tiers.contact import Contact
 
 class TiersDetails(BaseModel):
     # IDENTIFICATION