feat: multi-provider AI support with per-provider model selection

- Add llm-factory.ts: unified LLM provider abstraction (Google/Claude/OpenAI)
- Install @langchain/anthropic and @langchain/openai packages
- resolveAiProvider picks active provider from DB settings (Claude > OpenAI > Google)
- All AI graphs (reminder, new-patient, reschedule, internal-chat) now accept provider+model params
- Add claudeAiModel, openAiModel, googleAiModel columns to ai_settings table
- New PUT /api/ai/provider-model route to save selected model per provider
- UI model dropdowns for Claude (Haiku/Sonnet/Opus), OpenAI (GPT-5.x series), Google (Gemini 2.5/3.x)
- Google AI section also gets model selector alongside existing API key field

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

packages/db/shared/schemas/results/AiSettingsAggregateResult.schema.ts

@@ -8,6 +8,9 @@ export const AiSettingsAggregateResultSchema = z.object({  _count: z.object({
     openAiEnabled: z.number(),
     claudeAiKey: z.number(),
     claudeAiEnabled: z.number(),
+    claudeAiModel: z.number(),
+    openAiModel: z.number(),
+    googleAiModel: z.number(),
     dentalMgmtKey: z.number(),
     dentalMgmtEnabled: z.number(),
     afterHoursEnabled: z.number(),
@@ -28,6 +31,9 @@ export const AiSettingsAggregateResultSchema = z.object({  _count: z.object({
     apiKey: z.string().nullable(),
     openAiKey: z.string().nullable(),
     claudeAiKey: z.string().nullable(),
+    claudeAiModel: z.string().nullable(),
+    openAiModel: z.string().nullable(),
+    googleAiModel: z.string().nullable(),
     dentalMgmtKey: z.string().nullable()
   }).nullable().optional(),
   _max: z.object({
@@ -36,5 +42,8 @@ export const AiSettingsAggregateResultSchema = z.object({  _count: z.object({
     apiKey: z.string().nullable(),
     openAiKey: z.string().nullable(),
     claudeAiKey: z.string().nullable(),
+    claudeAiModel: z.string().nullable(),
+    openAiModel: z.string().nullable(),
+    googleAiModel: z.string().nullable(),
     dentalMgmtKey: z.string().nullable()
   }).nullable().optional()});

packages/db/shared/schemas/results/AiSettingsCreateResult.schema.ts

@@ -8,6 +8,9 @@ export const AiSettingsCreateResultSchema = z.object({
   openAiEnabled: z.boolean(),
   claudeAiKey: z.string(),
   claudeAiEnabled: z.boolean(),
+  claudeAiModel: z.string(),
+  openAiModel: z.string(),
+  googleAiModel: z.string(),
   dentalMgmtKey: z.string(),
   dentalMgmtEnabled: z.boolean(),
   afterHoursEnabled: z.boolean(),

packages/db/shared/schemas/results/AiSettingsDeleteResult.schema.ts

@@ -8,6 +8,9 @@ export const AiSettingsDeleteResultSchema = z.nullable(z.object({
   openAiEnabled: z.boolean(),
   claudeAiKey: z.string(),
   claudeAiEnabled: z.boolean(),
+  claudeAiModel: z.string(),
+  openAiModel: z.string(),
+  googleAiModel: z.string(),
   dentalMgmtKey: z.string(),
   dentalMgmtEnabled: z.boolean(),
   afterHoursEnabled: z.boolean(),

packages/db/shared/schemas/results/AiSettingsFindFirstResult.schema.ts

@@ -8,6 +8,9 @@ export const AiSettingsFindFirstResultSchema = z.nullable(z.object({
   openAiEnabled: z.boolean(),
   claudeAiKey: z.string(),
   claudeAiEnabled: z.boolean(),
+  claudeAiModel: z.string(),
+  openAiModel: z.string(),
+  googleAiModel: z.string(),
   dentalMgmtKey: z.string(),
   dentalMgmtEnabled: z.boolean(),
   afterHoursEnabled: z.boolean(),

packages/db/shared/schemas/results/AiSettingsFindManyResult.schema.ts

@@ -9,6 +9,9 @@ export const AiSettingsFindManyResultSchema = z.object({
   openAiEnabled: z.boolean(),
   claudeAiKey: z.string(),
   claudeAiEnabled: z.boolean(),
+  claudeAiModel: z.string(),
+  openAiModel: z.string(),
+  googleAiModel: z.string(),
   dentalMgmtKey: z.string(),
   dentalMgmtEnabled: z.boolean(),
   afterHoursEnabled: z.boolean(),

packages/db/shared/schemas/results/AiSettingsFindUniqueResult.schema.ts

@@ -8,6 +8,9 @@ export const AiSettingsFindUniqueResultSchema = z.nullable(z.object({
   openAiEnabled: z.boolean(),
   claudeAiKey: z.string(),
   claudeAiEnabled: z.boolean(),
+  claudeAiModel: z.string(),
+  openAiModel: z.string(),
+  googleAiModel: z.string(),
   dentalMgmtKey: z.string(),
   dentalMgmtEnabled: z.boolean(),
   afterHoursEnabled: z.boolean(),

packages/db/shared/schemas/results/AiSettingsGroupByResult.schema.ts

@@ -8,6 +8,9 @@ export const AiSettingsGroupByResultSchema = z.array(z.object({
   openAiEnabled: z.boolean(),
   claudeAiKey: z.string(),
   claudeAiEnabled: z.boolean(),
+  claudeAiModel: z.string(),
+  openAiModel: z.string(),
+  googleAiModel: z.string(),
   dentalMgmtKey: z.string(),
   dentalMgmtEnabled: z.boolean(),
   afterHoursEnabled: z.boolean(),
@@ -21,6 +24,9 @@ export const AiSettingsGroupByResultSchema = z.array(z.object({
     openAiEnabled: z.number(),
     claudeAiKey: z.number(),
     claudeAiEnabled: z.number(),
+    claudeAiModel: z.number(),
+    openAiModel: z.number(),
+    googleAiModel: z.number(),
     dentalMgmtKey: z.number(),
     dentalMgmtEnabled: z.number(),
     afterHoursEnabled: z.number(),
@@ -41,6 +47,9 @@ export const AiSettingsGroupByResultSchema = z.array(z.object({
     apiKey: z.string().nullable(),
     openAiKey: z.string().nullable(),
     claudeAiKey: z.string().nullable(),
+    claudeAiModel: z.string().nullable(),
+    openAiModel: z.string().nullable(),
+    googleAiModel: z.string().nullable(),
     dentalMgmtKey: z.string().nullable()
   }).nullable().optional(),
   _max: z.object({
@@ -49,6 +58,9 @@ export const AiSettingsGroupByResultSchema = z.array(z.object({
     apiKey: z.string().nullable(),
     openAiKey: z.string().nullable(),
     claudeAiKey: z.string().nullable(),
+    claudeAiModel: z.string().nullable(),
+    openAiModel: z.string().nullable(),
+    googleAiModel: z.string().nullable(),
     dentalMgmtKey: z.string().nullable()
   }).nullable().optional()
 }));

packages/db/shared/schemas/results/AiSettingsUpdateResult.schema.ts

@@ -8,6 +8,9 @@ export const AiSettingsUpdateResultSchema = z.nullable(z.object({
   openAiEnabled: z.boolean(),
   claudeAiKey: z.string(),
   claudeAiEnabled: z.boolean(),
+  claudeAiModel: z.string(),
+  openAiModel: z.string(),
+  googleAiModel: z.string(),
   dentalMgmtKey: z.string(),
   dentalMgmtEnabled: z.boolean(),
   afterHoursEnabled: z.boolean(),

packages/db/shared/schemas/results/AiSettingsUpsertResult.schema.ts

@@ -8,6 +8,9 @@ export const AiSettingsUpsertResultSchema = z.object({
   openAiEnabled: z.boolean(),
   claudeAiKey: z.string(),
   claudeAiEnabled: z.boolean(),
+  claudeAiModel: z.string(),
+  openAiModel: z.string(),
+  googleAiModel: z.string(),
   dentalMgmtKey: z.string(),
   dentalMgmtEnabled: z.boolean(),
   afterHoursEnabled: z.boolean(),