Add addon and services __init__.py files for proper module imports

Create package initialization files:
- addons/itsulu_blog_publisher/__init__.py - imports models and services
- Already created services/__init__.py with LLM exports
- Already created models/__init__.py with model exports
- Already created tests/__init__.py with test module exports

This enables proper Odoo addon discovery and Python package structure.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

addons/itsulu_blog_publisher/__init__.py

@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+"""
+itsulu_blog_publisher — AI-powered blog post generation addon.
+"""
+from . import models
+from . import services