chore: seed sample stickers

sticker-award/src/main/java/com/datadoghq/stickerlandia/stickeraward/sticker/StickerImageSeeder.java

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+package com.datadoghq.stickerlandia.stickeraward.sticker;
+
+import com.datadoghq.stickerlandia.stickeraward.sticker.entity.Sticker;
+import io.quarkus.runtime.StartupEvent;
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.enterprise.event.Observes;
+import jakarta.inject.Inject;
+import jakarta.transaction.Transactional;
+import org.jboss.logging.Logger;
+
+import java.io.InputStream;
+
+@ApplicationScoped
+public class StickerImageSeeder {
+
+    private static final Logger LOG = Logger.getLogger(StickerImageSeeder.class);
+
+    @Inject
+    StickerImageService stickerImageService;
+
+    @Inject
+    StickerRepository stickerRepository;
+
+    @Transactional
+    public void onStartup(@Observes StartupEvent ev) {
+        LOG.info("Starting sticker image seeding...");
+
+        try {
+            seedStickerImage("sticker-001", "/stickers/dd_icon_rgb.png", "Datadog Purple Logo");
+            seedStickerImage("sticker-002", "/stickers/dd_icon_white.png", "Datadog White Logo");
+
+            LOG.info("Sticker image seeding completed successfully");
+        } catch (Exception e) {
+            LOG.error("Failed to seed sticker images", e);
+        }
+    }
+
+    private void seedStickerImage(String stickerId, String resourcePath, String description) {
+        // Check if sticker exists and doesn't already have an image
+        Sticker sticker = Sticker.findById(stickerId);
+        if (sticker == null) {
+            LOG.warnf("Sticker %s not found, skipping image seeding", stickerId);
+            return;
+        }
+
+        if (sticker.getImageKey() != null && !sticker.getImageKey().isEmpty()) {
+            LOG.infof("Sticker %s already has image key %s, skipping", stickerId, sticker.getImageKey());
+            return;
+        }
+
+        try {
+            // Load image from resources
+            InputStream imageStream = getClass().getResourceAsStream(resourcePath);
+            if (imageStream == null) {
+                LOG.errorf("Could not find image resource: %s", resourcePath);
+                return;
+            }
+
+            // Get file size for upload
+            byte[] imageData = imageStream.readAllBytes();
+            imageStream.close();
+
+            // Upload image to our storage service
+            InputStream uploadStream = getClass().getResourceAsStream(resourcePath);
+            String imageKey = stickerImageService.uploadImage(uploadStream, "image/png", imageData.length);
+            uploadStream.close();
+
+            // Update sticker with image key
+            stickerRepository.updateStickerImageKey(stickerId, imageKey);
+
+            LOG.infof("Successfully seeded image for sticker %s with key %s (%s)", 
+                     stickerId, imageKey, description);
+
+        } catch (Exception e) {
+            LOG.errorf(e, "Failed to seed image for sticker %s from %s", stickerId, resourcePath);
+        }
+    }
+}