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>

apps/api/src/index.ts

@@ -18,6 +18,7 @@ import { groomingLogsRouter } from "./routes/groomingLogs.js";
 import { impersonationRouter } from "./routes/impersonation.js";
 import { settingsRouter } from "./routes/settings.js";
 import { searchRouter } from "./routes/search.js";
+import { getPresignedGetUrl } from "./lib/s3.js";
 import { calendarRouter } from "./routes/calendar.js";
 import { setupRouter } from "./routes/setup.js";
 import { getDb, businessSettings, eq, staff } from "@groombook/db";
@@ -55,11 +56,22 @@ app.route("/api/dev", devRouter);
 app.get("/api/branding", async (c) => {
   const db = getDb();
   const [row] = await db.select().from(businessSettings).limit(1);
-  const settings = row ?? { businessName: "GroomBook", primaryColor: "#4f8a6f", accentColor: "#8b7355", logoBase64: null, logoMimeType: null };
+  const settings = row ?? { businessName: "GroomBook", primaryColor: "#4f8a6f", accentColor: "#8b7355", logoBase64: null, logoMimeType: null, logoKey: null };
+
+  let logoUrl: string | null = null;
+  if (settings.logoKey) {
+    try {
+      logoUrl = await getPresignedGetUrl(settings.logoKey);
+    } catch {
+      // If S3 URL generation fails, fall back to legacy base64
+    }
+  }
+
   return c.json({
     businessName: settings.businessName,
     primaryColor: settings.primaryColor,
     accentColor: settings.accentColor,
+    logoUrl,
     logoBase64: settings.logoBase64,
     logoMimeType: settings.logoMimeType,
   });