refactor: Rename Property/PropertyType to CustomFieldValue/CustomField

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

docs/development-progress-log.md

@@ -131,11 +131,11 @@ Based on closed PRs from https://git.local-it.org/local-it/mitgliederverwaltung/
 
 **Sprint 3 - 28.05 - 09.07**
 - Member CRUD operations
-- Basic property system
+- Basic custom field system
 - Initial UI with Tailwind CSS
 
 **Sprint 4 - 09.07 - 30.07**
-- Property types implementation
+- CustomFieldValue types implementation
 - Data validation
 - Error handling improvements
 
@@ -154,7 +154,7 @@ Based on closed PRs from https://git.local-it.org/local-it/mitgliederverwaltung/
 **PR #147:** *Add seed data for members*
 - Comprehensive seed data
 - Test users and members
-- Property type examples
+- CustomFieldValue type examples
 
 #### Phase 3: Search & Navigation (Sprint 6)
 
@@ -379,21 +379,21 @@ end
 
 **Complete documentation:** See [`docs/email-sync.md`](email-sync.md) for decision tree and sync rules.
 
-#### 4. Property System (EAV Pattern)
+#### 4. CustomFieldValue System (EAV Pattern)
 
 **Implementation:** Entity-Attribute-Value pattern with union types
 
 ```elixir
-# Property Type defines schema
-defmodule Mv.Membership.PropertyType do
+# CustomFieldValue Type defines schema
+defmodule Mv.Membership.CustomField do
   attribute :name, :string           # "Membership Number"
   attribute :value_type, :atom       # :string, :integer, :boolean, :date, :email
   attribute :immutable, :boolean     # Can't change after creation
   attribute :required, :boolean      # All members must have this
 end
 
-# Property stores values
-defmodule Mv.Membership.Property do
+# CustomFieldValue stores values
+defmodule Mv.Membership.CustomFieldValue do
   attribute :value, :union,          # Polymorphic value storage
     constraints: [
       types: [
@@ -405,7 +405,7 @@ defmodule Mv.Membership.Property do
       ]
     ]
   belongs_to :member
-  belongs_to :property_type
+  belongs_to :custom_field
 end
 ```
 
@@ -413,12 +413,12 @@ end
 - Clubs need different custom fields
 - No schema migrations for new fields
 - Type safety with union types
-- Centralized property management
+- Centralized custom field management
 
 **Constraints:**
-- One property per type per member (composite unique index)
+- One custom field value per custom field per member (composite unique index)
 - Properties deleted with member (CASCADE)
-- Property types protected if in use (RESTRICT)
+- CustomFieldValue types protected if in use (RESTRICT)
 
 #### 5. Authentication Strategy
 
@@ -593,7 +593,7 @@ end
 #### Database Migrations
 
 **Key migrations in chronological order:**
-1. `20250528163901_initial_migration.exs` - Core tables (members, properties, property_types)
+1. `20250528163901_initial_migration.exs` - Core tables (members, custom_field_values, custom_fields)
 2. `20250617090641_member_fields.exs` - Member attributes expansion
 3. `20250620110850_add_accounts_domain.exs` - Users & tokens tables
 4. `20250912085235_AddSearchVectorToMembers.exs` - Full-text search (tsvector + GIN index)
@@ -772,7 +772,7 @@ end
 - Admin user: `admin@mv.local` / `testpassword`
 - Sample members: Hans Müller, Greta Schmidt, Friedrich Wagner
 - Linked accounts: Maria Weber, Thomas Klein
-- Property types: String, Date, Boolean, Email
+- CustomFieldValue types: String, Date, Boolean, Email
 
 **Test Helpers:**
 ```elixir
@@ -956,9 +956,9 @@ mix credo --strict
 mix credo suggest --format=oneline
 ```
 
-### 8. Property Value Type Mismatch
+### 8. CustomFieldValue Value Type Mismatch
 
-**Issue:** Property value doesn't match property_type definition.
+**Issue:** CustomFieldValue value doesn't match custom_field definition.
 
 **Error:**
 ```
@@ -966,16 +966,16 @@ mix credo suggest --format=oneline
 ```
 
 **Solution:**
-Ensure property value matches property_type.value_type:
+Ensure custom field value matches custom_field.value_type:
 
 ```elixir
-# Property Type: value_type = :integer
-property_type = get_property_type("age")
+# CustomFieldValue Type: value_type = :integer
+custom_field = get_custom_field("age")
 
-# Property Value: must be integer union type
-{:ok, property} = create_property(%{
+# CustomFieldValue Value: must be integer union type
+{:ok, custom_field_value} = create_custom_field_value(%{
   value: %{type: :integer, value: 25},  # Not "25" as string
-  property_type_id: property_type.id
+  custom_field_id: custom_field.id
 })
 ```