feat: add Docker support and texture deletion functionality

Add Docker configuration with standalone output mode for containerized
deployment. Implement texture deletion API with proper error handling
and user feedback. Fix skin viewer sizing issues by using explicit
dimensions and removing conflicting layout properties. Add captcha
ID parameter to registration flow. Improve profile page UX including
Yggdrasil password reset display and character card editing controls.

.dockerignore

@@ -0,0 +1,41 @@
+# 依赖
+node_modules
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Next.js 构建产物
+.next
+out
+
+# 测试
+coverage
+.nyc_output
+
+# IDE
+.vscode
+.idea
+*.swp
+*.swo
+*~
+
+# 操作系统
+.DS_Store
+Thumbs.db
+
+# Git
+.git
+.gitignore
+
+# Docker
+Dockerfile
+.dockerignore
+
+# 文档
+docs
+*.md
+
+# 其他
+.env
+.env.local
+.env.*.local