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>

neode-ui/docker/nginx-demo.conf

@@ -86,6 +86,18 @@ http {
             proxy_set_header X-Real-IP $remote_addr;
         }
 
+        # Proxy Ollama (local AI) requests to backend
+        location /aiui/api/ollama/ {
+            proxy_pass http://neode-backend:5959;
+            proxy_http_version 1.1;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_buffering off;
+            proxy_cache off;
+            proxy_read_timeout 300s;
+            proxy_set_header Connection "";
+        }
+
         # Proxy Claude API requests to backend (which handles API key + streaming)
         location /aiui/api/claude/ {
             proxy_pass http://neode-backend:5959;