feat: add AI Diagram Agent - 2-agent LangGraph with Mermaid.js
- New diagram agent: Planner generates Mermaid code, Responder explains - FastAPI route: /api/diagram/chat + /clear with Redis session history - Frontend: split-pane UI with canvas pan/zoom (scroll wheel + drag) - Auto-fit diagram to view, grid background, PNG export - Prompt enforces ASCII syntax labels for Mermaid compatibility - Planner LLM max_tokens=4000 for complex diagram generation - Supports: flowchart, sequence, class, ER, gantt, mindmap, pie chart
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backend/static/auth.js
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