fix: FilePreview fileType case + Tailwind v4 gradient transparent bug

- FilePreview.vue: add normalizedFileType computed to handle backend
  returning uppercase HTML/MD/PPTX (fixes preview/download buttons)
- FilePreview.vue: bg-gradient-to-r from-orange-500 -> bg-orange-500
  (Tailwind v4 gradient + CSS variable = transparent)
- ReportCard.vue: bg-gradient-to-r -> bg-orange-600 for selected state
- Add .opencode/, node_modules/, dist/ to .gitignore
- Initial git setup for publish project

docker-compose.yml

@@ -0,0 +1,44 @@
+services:
+  # Backend: Spring Boot JAR
+  backend:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: publish-backend
+    restart: unless-stopped
+    ports:
+      - "37821:8080"
+    environment:
+      - SPRING_PROFILES_ACTIVE=prod
+      - JAVA_OPTS=-Xms256m -Xmx512m
+      - UPLOAD_DIR=/app/uploads
+    volumes:
+      - uploads-data2:/app/uploads
+    networks:
+      - app-network
+
+  # Frontend: Python HTTP server with API proxy
+  frontend:
+    build:
+      context: .
+      dockerfile: Dockerfile.frontend
+    container_name: publish-frontend
+    restart: unless-stopped
+    ports:
+      - "41733:80"
+    environment:
+      - BACKEND_URL=http://publish-backend:8080
+    volumes:
+      - uploads-data2:/app/uploads
+    networks:
+      - app-network
+    depends_on:
+      - backend
+
+networks:
+  app-network:
+    driver: bridge
+
+volumes:
+  uploads-data2:
+    driver: local