load trending images from tmdb at startup

- need TMDB_API_KEY as environment variable
- mount /cache for data persistence

Signed-off-by: Peter Siegmund <developer@mars3142.org>

server/cinema/lib/feature/poster/domain/poster.enums.dart

@@ -0,0 +1,16 @@
+enum PosterOrientation {
+  horizontal,
+  vertical,
+}
+
+enum PosterFormat {
+  png,
+  jpeg,
+  bmp,
+}
+
+enum PosterOutput {
+  image,
+  lvgl,
+  lvglBinary,
+}