fix: add missing 'short'/'medium'/'silky' to coat_type enum (GRO-1971)

Migration 0031_buffer_rules.sql created coat_type enum with values
('smooth', 'double', 'wire', 'curly', 'long', 'hairless') but omitted
'short', 'medium', and 'silky' which are defined in schema.ts and
required by seed.ts.

Added 0035_add_missing_coat_type_values.sql to add the missing values
using ALTER TYPE ... ADD VALUE IF NOT EXISTS.

This resolves the UAT seed failure:
  PostgresError: invalid input value for enum coat_type: "short"
  code: '22P02' routine: 'enum_in' (packages/db/src/seed.ts)

Dev→UAT SDLC: QA (Lint Roller) review, then CTO review.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/db/migrations/meta/_journal.json

@@ -246,6 +246,13 @@
       "when": 1751140800000,
       "tag": "0034_extend_pet_profile_columns",
       "breakpoints": true
+    },
+    {
+      "idx": 35,
+      "version": "7",
+      "when": 1751480000000,
+      "tag": "0035_add_missing_coat_type_values",
+      "breakpoints": true
     }
   ]
 }