refactor: simplify schema names and remove provider id columns

backend/app/repositories/companies_repo.py

@@ -21,8 +21,7 @@ class CompaniesRepository:
             pattern = f"%{keyword}%"
             cond = or_(
                 Company.company_key.ilike(pattern),
-                Company.display_name.ilike(pattern),
-                Company.legal_name.ilike(pattern),
+                Company.name.ilike(pattern),
             )
             stmt = stmt.where(cond)
             count_stmt = count_stmt.where(cond)
@@ -34,15 +33,13 @@ class CompaniesRepository:
         self,
         *,
         company_key: str,
-        display_name: str,
-        legal_name: str | None,
+        name: str,
         provider_group_id: str | None = None,
         status: str = "active",
     ) -> Company:
         item = Company(
             company_key=company_key,
-            display_name=display_name,
-            legal_name=legal_name,
+            name=name,
             provider_group_id=provider_group_id,
             status=status,
         )
@@ -55,15 +52,12 @@ class CompaniesRepository:
         self,
         item: Company,
         *,
-        display_name: str | None = None,
-        legal_name: str | None = None,
+        name: str | None = None,
         provider_group_id: str | None = None,
         status: str | None = None,
     ) -> Company:
-        if display_name is not None:
-            item.display_name = display_name
-        if legal_name is not None:
-            item.legal_name = legal_name
+        if name is not None:
+            item.name = name
         if provider_group_id is not None:
             item.provider_group_id = provider_group_id
         if status is not None: