[WIP] Implement JSON-based post type, taxonomy, and field loading system

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Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

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<issue_title>Implement JSON-based Post Type, Taxonomy, and Field Loading System</issue_title>
<issue_description>## Overview

Implement a JSON-based loading system for post types, taxonomies, and custom fields, similar to the Tour Operator content models system.

This will replace the current hardcoded PHP classes (class-post-types.php, class-taxonomies.php, class-fields.php) with a dynamic loader that reads from JSON configuration files.

Goals

1. JSON-driven Configuration: Load post types, taxonomies, and SCF fields from JSON files in /post-types/ folder
2. Maintain Mustache Templating: All generated PHP classes must retain {{mustache}} placeholders for generator compatibility
3. Validation: Create JSON schema for post-type.json files
4. Backward Compatibility: Existing scaffold functionality should remain intact

Reference Implementation

Github

• You will need to branch off of the Audit branch

Tour Operator Implementation:

• JSON files: /post-types/*.json
• Loader: Content_Model_Json_Initializer
• Manager: Content_Model_Manager

Proposed Structure

1. Directory Structure

block-plugin-scaffold/
├── post-types/
│   ├── {{slug}}.json              # Main post type config
│   └── schema.json                # JSON Schema for validation
├── inc/
│   ├── class-post-types.php       # Modified to load from JSON
│   ├── class-taxonomies.php       # Modified to load from JSON
│   └── class-fields.php           # Modified to load from JSON
└── scripts/
    └── validate-post-types.js     # JSON validation script

2. JSON Schema Requirements

The post-type.json schema should include all parameters from:

register_post_type() Parameters

• label (string)
• labels (object with all label variations)
• description (string)
• public (boolean)
• hierarchical (boolean)
• exclude_from_search (boolean)
• publicly_queryable (boolean)
• show_ui (boolean)
• show_in_menu (boolean|string)
• show_in_nav_menus (boolean)
• show_in_admin_bar (boolean)
• show_in_rest (boolean)
• rest_base (string)
• rest_namespace (string)
• rest_controller_class (string)
• menu_position (integer)
• menu_icon (string)
• capability_type (string)
• capabilities (object)
• map_meta_cap (boolean)
• supports (array)
• register_meta_box_cb (string)
• taxonomies (array)
• has_archive (boolean|string)
• rewrite (object|boolean)
• query_var (boolean|string)
• can_export (boolean)
• delete_with_user (boolean)
• template (array)
• template_lock (string|boolean)
• _builtin (boolean)
• _edit_link (string)

register_taxonomy() Parameters

• slug (string)
• object_type (array) - which post types to associate with
• labels (object)
• description (string)
• public (boolean)
• publicly_queryable (boolean)
• hierarchical (boolean)
• show_ui (boolean)
• show_in_menu (boolean)
• show_in_nav_menus (boolean)
• show_in_rest (boolean)
• rest_base (string)
• rest_namespace (string)
• rest_controller_class (string)
• show_tagcloud (boolean)
• show_in_quick_edit (boolean)
• show_admin_column (boolean)
• meta_box_cb (string|boolean)
• meta_box_sanitize_cb (string)
• capabilities (object)
• rewrite (object|boolean)
• query_var (string|boolean)
• update_count_callback (string)
• default_term (string|array)
• sort (boolean)
• args (array)
• _builtin (boolean)

SCF (Secure Custom Fields) Parameters

• fields (array of field objects)
  • slug (string)
  • type (string) - text, textarea, number, email, url, password, wysiwyg, oembed, image, file, gallery, select, checkbox, radio, true_false, link, post_object, relationship, taxonomy, user, etc.
  • label (string)
  • description (string)
  • required (boolean)
  • conditional_logic (array)
  • wrapper (object)
  • default_value (mixed)
  • placeholder (string)
  • prepend (string)
  • append (string)
  • maxlength (integer)
  • readonly (boolean)
  • disabled (boolean)
  • return_format (string)
  • library (string)
  • min_size (string)
  • max_size (string)
  • mime_types (string)
  • choices (object) - for select/radio/checkbox
  • allow_null (boolean)
  • multiple (boolean)
  • ui (boolean)
  • ajax (boolean)
  • post_type (array)
  • taxonomy (array)
  • filters (array)
  • `visible...

• Fixes Implement JSON-based Post Type, Taxonomy, and Field Loading System #8

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