fix: align root src/ enum values with packages/db schema

Root src/routes/ used stale enum values (xlarge→extra_large,
smooth→silky, missing short/medium/silky from coatType) and
sizeCategory→petSizeCategory field name mismatch with the
pets table column.

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

src/routes/book.ts

@@ -193,8 +193,8 @@ bookRouter.post(
         name: body.petName,
         species: body.petSpecies,
         breed: body.petBreed ?? null,
-        coatType: (body.petCoatType ?? null) as "smooth" | "double" | "wire" | "curly" | "long" | "hairless" | null,
-        petSizeCategory: (body.petSizeCategory ?? null) as "small" | "medium" | "large" | "xlarge" | null,
+        coatType: (body.petCoatType ?? null) as "short" | "medium" | "long" | "double" | "wire" | "silky" | "curly" | "hairless" | null,
+        petSizeCategory: (body.petSizeCategory ?? null) as "small" | "medium" | "large" | "extra_large" | null,
       })
       .returning();
     const pet = petInserted[0];