feat: enhance Docker setup with environment variable management and add example docker-compose file

docker-compose.example.yml

@@ -0,0 +1,29 @@
+version: '3.8'
+
+services:
+  mice:
+    container_name: mice-public
+    image: ghcr.io/sillyangel/mice:latest
+    ports:
+      - "40625:40625"
+    environment:
+      # Navidrome Server Configuration
+      - NAVIDROME_URL=https://navi.sillyangel.dev
+      - NAVIDROME_USERNAME=kryptonite
+      - NAVIDROME_PASSWORD=kryptonite
+
+      # PostHog Analytics
+      - POSTHOG_KEY=phc_Sa39J7754MwaHrPxYiWnWETVSD3g1cU4nOplMGczRE9
+      - POSTHOG_HOST=https://us.i.posthog.com
+
+      # Application Port
+      - PORT=40625
+    
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:40625"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+    
+    restart: unless-stopped