feat: add Ollama (local AI) integration for AIUI

- Create Ollama provider plugin in AIUI (ollama-provider.ts)
- Register Ollama alongside Claude in plugin system
- Auto-detect installed models via /api/tags endpoint
- Add Ollama proxy in mock backend (forwards to localhost:11434)
- Add nginx proxy rules for /aiui/api/ollama/ (both HTTP and HTTPS)
- Rebuild AIUI dist with Ollama provider included
- Qwen 2.5 Coder 3B installed on dev server via Ollama

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

demo/aiui/assets/chunk-55IACEB6-BkuxEf4w.js

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+import{_ as a,d as o}from"./mermaid.core-CJYA4M6R.js";var d=a((t,e)=>{let n;return e==="sandbox"&&(n=o("#i"+t)),(e==="sandbox"?o(n.nodes()[0].contentDocument.body):o("body")).select(`[id="${t}"]`)},"getDiagramElement");export{d as g};