feat(api): add extended pet profile fields — schema, migration, CRUD, Zod validation

Adds five new nullable columns to the pets table:
- coat_type (text)
- temperament_score (integer, range 1–5)
- temperament_flags (jsonb, string[])
- medical_alerts (jsonb, typed MedicalAlert[])
- preferred_cuts (jsonb, string[])

Also:
- Exports MedicalAlert interface and MedicalAlertSeverity type from schema
- Updates shared Pet type in packages/types
- Adds Zod validators for all fields (ranges, max lengths, enum)
- Adds 14 tests covering happy path and validation edge cases
- Fixes drizzle.config.ts schema path (was ./src/schema.ts, correct is ./src/db/schema.ts)

Refs: GRO-1176

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

apps/api/src/db/schema.ts

@@ -12,6 +12,16 @@ import {
   uuid,
 } from "drizzle-orm/pg-core";
 
+// ─── Shared types ───────────────────────────────────────────────────────────────
+
+export type MedicalAlertSeverity = "low" | "medium" | "high";
+
+export interface MedicalAlert {
+  type: string;
+  description: string;
+  severity: MedicalAlertSeverity;
+}
+
 // ─── Enums ────────────────────────────────────────────────────────────────────
 
 export const appointmentStatusEnum = pgEnum("appointment_status", [
@@ -146,6 +156,12 @@ export const pets = pgTable(
     photoKey: text("photo_key"),
     photoUploadedAt: timestamp("photo_uploaded_at"),
     image: text("image"),
+    // Extended profile fields
+    coatType: text("coat_type"),
+    temperamentScore: integer("temperament_score"),
+    temperamentFlags: jsonb("temperament_flags").$type<string[]>().default([]),
+    medicalAlerts: jsonb("medical_alerts").$type<MedicalAlert[]>().default([]),
+    preferredCuts: jsonb("preferred_cuts").$type<string[]>().default([]),
     createdAt: timestamp("created_at").notNull().defaultNow(),
     updatedAt: timestamp("updated_at").notNull().defaultNow(),
   },