feat: AI API Setting page with 4 provider sections and toggles

Add OpenAI, Claude AI, and DentalManagement AI sections to the AI API
Setting page, each with a masked API key input and an on/off toggle
(defaulting to off). Rename sidebar label from "Google AI Settings" to
"AI API Setting". Add provider-key and provider-enabled backend endpoints
and extend the AiSettings schema with 6 new fields.

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

packages/db/generated/prisma/index-browser.js

@@ -435,6 +435,13 @@ exports.Prisma.AiSettingsScalarFieldEnum = {
   id: 'id',
   userId: 'userId',
   apiKey: 'apiKey',
+  aiEnabled: 'aiEnabled',
+  openAiKey: 'openAiKey',
+  openAiEnabled: 'openAiEnabled',
+  claudeAiKey: 'claudeAiKey',
+  claudeAiEnabled: 'claudeAiEnabled',
+  dentalMgmtKey: 'dentalMgmtKey',
+  dentalMgmtEnabled: 'dentalMgmtEnabled',
   afterHoursEnabled: 'afterHoursEnabled',
   openPhoneReply: 'openPhoneReply'
 };