Add gallery admin and video media support.

This updates gallery handling to support video playback with generated poster thumbnails, adds authenticated admin upload/delete flows, and improves dev/runtime behavior including reliable thumbnail generation and media-safe response handling.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.yaml

@@ -5,6 +5,8 @@ services:
     image: technical.kiwi/website
     container_name: technicalkiwi
     build: ./
+    volumes:
+      - ./app/images:/app/images
     env_file:
       - .env
     #networks: