feat: add Radarr language dashboard with Docker support

Add a Flask-based dashboard for monitoring audio/subtitle languages in Radarr media files. Includes ffprobe integration for media analysis, SQLite caching, path mapping between Radarr and host filesystems, and a responsive web UI with filtering and statistics.

docker-compose.yml

@@ -0,0 +1,30 @@
+services:
+  radarr-language-dashboard:
+    build: .
+    container_name: radarr-language-dashboard
+    restart: unless-stopped
+    ports:
+      - "8099:8099"
+    environment:
+      RADARR_URL: "http://radarr:7878"
+      RADARR_API_KEY: "CHANGE_ME"
+
+      # Pfad, den Radarr in seiner API meldet:
+      RADARR_MEDIA_PATH: "/data/filme"
+
+      # Pfad derselben Dateien INNERHALB dieses Containers:
+      LOCAL_MEDIA_PATH: "/media/filme"
+
+      DB_PATH: "/data/cache.db"
+      LOG_LEVEL: "INFO"
+    volumes:
+      # Host-Pfad deiner Film-Library -> interner Dashboard-Pfad
+      - /nesflix/filme:/media/filme:ro
+      - ./data:/data
+    networks:
+      - media
+
+networks:
+  media:
+    external: true
+    name: media-stack_default