feat(demo): expand demo pet images and seed data with diverse breed showcase

Generated 16 diverse pet images for demo site using MiniMax image generation:
- Multiple dog breeds (Golden Retriever, Poodle, Labrador, Shih Tzu, Cocker Spaniel, Schnauzer, Maltese, Dachshund, Pomeranian)
- Professional grooming styles and poses
- Studio lighting for quality showcase

Updated seed.ts to create 9 demo pets with image references:
- Expands from single demo pet to diverse pet portfolio
- Images deployed to apps/web/public/demo-pets/
- Each pet has breed-accurate styling and professional grooming

This completes GRO-395 demo assets expansion using allocated MiniMax credits.

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

packages/db/src/schema.ts

@@ -348,6 +348,7 @@ export const businessSettings = pgTable("business_settings", {
   businessName: text("business_name").notNull().default("GroomBook"),
   logoBase64: text("logo_base64"),
   logoMimeType: text("logo_mime_type"),
+  logoKey: text("logo_key"),
   primaryColor: text("primary_color").notNull().default("#4f8a6f"),
   accentColor: text("accent_color").notNull().default("#8b7355"),
   createdAt: timestamp("created_at").notNull().defaultNow(),