refactor: tool plugin registry - each tool in separate file

app/api/voice/chat/route.ts

@@ -7,8 +7,7 @@ import { HttpsProxyAgent } from 'https-proxy-agent'
 
 import { voiceBus } from '@/lib/voice-bus'
 import { systemPrompt } from '@/lib/voice-prompts'
-import { TOOL_SCHEMAS } from '@/lib/voice-tool-schemas'
-import { executeTool } from '@/lib/voice-executors'
+import { TOOL_SCHEMAS, executeTool } from '@/lib/tools/_registry'
 import { cleanForSpeech, stripFillers, isResetCommand } from '@/lib/voice-text'
 import {
   loadHistory, saveHistory, resetHistory,