feat: add schedule column labels, office hours enforcement, and appointment move fix

- Schedule columns default to labels A–F (localStorage, per-browser, click to rename)
- Settings → Advanced → Office Hours: configure Doctors (A-C) and Hygienists (D-F) AM/PM hours per weekday
- Gray out schedule slots outside office hours; override dialog for manual exceptions
- Override Office Hours toggle: select specific dates where all slots are open
- Fix appointment move: send only real DB fields to avoid Zod strict-mode rejection of computed fields (hasProcedures, hasClaimWithNumber)
- Fix backend PUT /appointments: safe error logging to prevent Prisma error crashing Node inspect
- Add OfficeHours Prisma model and GET/PUT /api/office-hours route

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

packages/db/prisma/schema.prisma

@@ -38,6 +38,8 @@ model User {
   cloudFiles           CloudFile[]
   communications       Communication[]
   twilioSettings       TwilioSettings?
+  aiSettings           AiSettings?
+  officeHours          OfficeHours?
 }
 
 model Patient {
@@ -559,3 +561,23 @@ model TwilioSettings {
 
   @@map("twilio_settings")
 }
+
+model AiSettings {
+  id     Int    @id @default(autoincrement())
+  userId Int    @unique
+  apiKey String
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("ai_settings")
+}
+
+model OfficeHours {
+  id     Int  @id @default(autoincrement())
+  userId Int  @unique
+  data   Json
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("office_hours")
+}