refactor: Rename Property/PropertyType to CustomFieldValue/CustomField

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

lib/membership/custom_field.ex

@@ -0,0 +1,88 @@
+defmodule Mv.Membership.CustomField do
+  @moduledoc """
+  Ash resource defining the schema for custom member fields.
+
+  ## Overview
+  CustomFields define the "schema" for custom fields in the membership system.
+  Each CustomField specifies the name, data type, and behavior of a custom field
+  that can be attached to members via CustomFieldValue resources.
+
+  ## Attributes
+  - `name` - Unique identifier for the custom field (e.g., "phone_mobile", "birthday")
+  - `value_type` - Data type constraint (`:string`, `:integer`, `:boolean`, `:date`, `:email`)
+  - `description` - Optional human-readable description
+  - `immutable` - If true, custom field values cannot be changed after creation
+  - `required` - If true, all members must have this custom field (future feature)
+
+  ## Supported Value Types
+  - `:string` - Text data (unlimited length)
+  - `:integer` - Numeric data (64-bit integers)
+  - `:boolean` - True/false flags
+  - `:date` - Date values (no time component)
+  - `:email` - Validated email addresses
+
+  ## Relationships
+  - `has_many :custom_field_values` - All custom field values of this type
+
+  ## Constraints
+  - Name must be unique across all custom fields
+  - Cannot delete a custom field that has existing custom field values (RESTRICT)
+
+  ## Examples
+      # Create a new custom field
+      CustomField.create!(%{
+        name: "phone_mobile",
+        value_type: :string,
+        description: "Mobile phone number"
+      })
+
+      # Create a required custom field
+      CustomField.create!(%{
+        name: "emergency_contact",
+        value_type: :string,
+        required: true
+      })
+  """
+  use Ash.Resource,
+    domain: Mv.Membership,
+    data_layer: AshPostgres.DataLayer
+
+  postgres do
+    table "custom_fields"
+    repo Mv.Repo
+  end
+
+  actions do
+    defaults [:create, :read, :update, :destroy]
+    default_accept [:name, :value_type, :description, :immutable, :required]
+  end
+
+  attributes do
+    uuid_primary_key :id
+
+    attribute :name, :string, allow_nil?: false, public?: true
+
+    attribute :value_type, :atom,
+      constraints: [one_of: [:string, :integer, :boolean, :date, :email]],
+      allow_nil?: false,
+      description: "Defines the datatype `CustomFieldValue.value` is interpreted as"
+
+    attribute :description, :string, allow_nil?: true, public?: true
+
+    attribute :immutable, :boolean,
+      default: false,
+      allow_nil?: false
+
+    attribute :required, :boolean,
+      default: false,
+      allow_nil?: false
+  end
+
+  relationships do
+    has_many :custom_field_values, Mv.Membership.CustomFieldValue
+  end
+
+  identities do
+    identity :unique_name, [:name]
+  end
+end