feat: add Docker support with Dockerfile and docker-compose.yml, update asset upload to use backend URL

.dockerignore

@@ -0,0 +1,47 @@
+# Nuxt build artifacts
+.output
+.nuxt
+dist
+
+# Node modules
+node_modules
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Environment files
+.env
+.env.local
+.env.*.local
+
+# IDE
+.vscode
+.idea
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Git
+.git
+.gitignore
+
+# Docker
+Dockerfile
+.dockerignore
+docker-compose.yml
+
+# Testing
+coverage
+.nyc_output
+
+# Misc
+*.md
+!README.md