feat(chat): add auto-summarization with token tracking UI

Add /summarize command, token usage bar, and summary endpoint.
Add JSON tags to config/platform/scanner structs for API serialization.

💘 Generated with Crush

Assisted-by: MiniMax-M2.7 via Crush <crush@charm.land>

web/src/api/client.js

@@ -56,6 +56,7 @@ const api = {
   saveTerminalSettings: (settings) => request('/terminal/settings', { method: 'PUT', body: JSON.stringify(settings) }),
   getChatHistory: () => request('/chat/history'),
   clearChat: () => request('/chat/clear', { method: 'POST' }),
+  summarizeChat: () => request('/chat/summarize', { method: 'POST' }),
   sendChat: (message, stream = true, onChunk, signal) => {
     if (!stream) {
       return request('/chat', { method: 'POST', body: JSON.stringify({ message, stream: false }) })