Add: Deep architecture teardown of Dify's source code

[NeuZhou]

Dify teardown - source-level analysis of Dify's architecture covering:

• The graphon DAG execution engine
• 7+ container deployment architecture
• 30+ vector database integrations
• Plugin daemon (separate process :5003)
• Middleware layer design

Part of awesome-ai-anatomy which has teardowns of 11 AI agent projects.