refactor: Rename Property/PropertyType to CustomFieldValue/CustomField

Complete refactoring of resources, database tables, code references, tests, and documentation for improved naming consistency.

lib/membership/email.ex

@@ -4,7 +4,7 @@ defmodule Mv.Membership.Email do
 
   ## Overview
   This type extends `:string` with email-specific validation constraints.
-  It ensures that email values stored in Property resources are valid email
+  It ensures that email values stored in CustomFieldValue resources are valid email
   addresses according to a standard regex pattern.
 
   ## Validation Rules
@@ -14,12 +14,12 @@ defmodule Mv.Membership.Email do
   - Automatic trimming of leading/trailing whitespace
 
   ## Usage
-  This type is used in the Property union type for properties with
-  `value_type: :email` in PropertyType definitions.
+  This type is used in the CustomFieldValue union type for custom fields with
+  `value_type: :email` in CustomField definitions.
 
   ## Example
-      # In a property type definition
-      PropertyType.create!(%{
+      # In a custom field definition
+      CustomField.create!(%{
         name: "work_email",
         value_type: :email
       })