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/buffer-rules.ts

@@ -19,8 +19,8 @@ bufferRulesRouter.use("*", requireRole("manager"));
 
 const createBufferRuleSchema = z.object({
   serviceId: z.string().uuid(),
-  sizeCategory: z.enum(["small", "medium", "large", "xlarge"]).optional(),
-  coatType: z.enum(["smooth", "double", "wire", "curly", "long", "hairless"]).optional(),
+  sizeCategory: z.enum(["small", "medium", "large", "extra_large"]).optional(),
+  coatType: z.enum(["short", "medium", "long", "double", "wire", "silky", "curly", "hairless"]).optional(),
   bufferMinutes: z.number().int().positive(),
 });