feat(GRO-1174): persist petSizeCategory and petCoatType from booking

- Add petSizeCategory and petCoatType to bookingSchema zod validator (optional)
- Save coatType to pets row on booking creation
- Add coatType and petSizeCategory columns to pets DB schema
- Add coatType and petSizeCategory to Pet interface in @groombook/types

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/routes/book.ts

@@ -112,6 +112,8 @@ const bookingSchema = z.object({
   petName: z.string().min(1).max(200),
   petSpecies: z.string().min(1).max(100),
   petBreed: z.string().max(100).optional(),
+  petSizeCategory: z.string().max(50).optional(),
+  petCoatType: z.string().max(50).optional(),
   notes: z.string().max(2000).optional(),
 });
 
@@ -191,6 +193,7 @@ bookRouter.post(
         name: body.petName,
         species: body.petSpecies,
         breed: body.petBreed ?? null,
+        coatType: body.petCoatType ?? null,
       })
       .returning();
     const pet = petInserted[0];