v1.0.0 - Django Model Signals Architectural Pattern & Implementation

What's New in v1.0.0

• 📡 Django Observer Pattern: Complete reference architecture for event-driven decoupled model interactions using Django Signals.
• 📐 Native Mermaid Sequence Diagram: Step-by-step visual trace of client requests, ORM events, signal dispatchers, and receiver execution.
• 🔒 Zero-Secret & Clean Repo Hygiene: Untracked local SQLite artifacts, enforced .gitignore, and added .env.example.
• 📄 Open-Source MIT License: Formally licensed for educational and commercial adoption.
• 🏷️ SEO & Discoverability: High-impact Django and Software Architecture topics with Shields.io status badges.