feat: frutiger aero visual overhaul — backgrounds, glass panels, cast photos, full mosaic

crates/application/src/config.rs

@@ -10,6 +10,7 @@ pub struct AppConfig {
 pub struct WrapUpConfig {
     pub font_path: Option<String>,
     pub logo_path: Option<String>,
+    pub bg_dir: Option<String>,
     pub ffmpeg_path: String,
     pub max_concurrent_renders: usize,
 }
@@ -39,6 +40,7 @@ impl WrapUpConfig {
         Self {
             font_path: std::env::var("WRAPUP_FONT_PATH").ok(),
             logo_path: std::env::var("WRAPUP_LOGO_PATH").ok(),
+            bg_dir: std::env::var("WRAPUP_BG_DIR").ok(),
             ffmpeg_path: std::env::var("FFMPEG_PATH").unwrap_or_else(|_| "ffmpeg".to_string()),
             max_concurrent_renders: std::env::var("WRAPUP_MAX_CONCURRENT")
                 .ok()