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/shared/.prisma-zod-generator-manifest.json

@@ -1,7 +1,7 @@
 {
   "version": "1.0",
   "generatorVersion": "1.0.0",
-  "generatedAt": "2026-05-29T02:31:29.315Z",
+  "generatedAt": "2026-06-05T20:31:36.056Z",
   "outputPath": "/home/ff/Desktop/DentalManagementMH06/packages/db/shared",
   "files": [
     "schemas/enums/TransactionIsolationLevel.schema.ts",