feat(devcontainer): add enhanced Maven development environment with Java 21, Bun, and SSH support

- Add Docker Compose configuration for Maven + Java 21 development container
- Include SSH server support for remote development (Zed editor compatible)
- Install Bun package manager and opencode-ai for enhanced development workflow
- Provide Makefile with commands for build, up, down, restart, logs, shell, ssh, and clean
- Add .env.example template for configurable ports and paths
- Include .gitignore for Java/Maven artifacts and IDE files
- Configure USTC mirrors for faster package installation
- Support persistent volume mounting for root user configuration (.ssh, .m2 cache)

java-maven/vibe-enhance-version/.env.example

@@ -0,0 +1,20 @@
+# ==============================================
+# Maven + Java + Bun 开发容器配置模板
+# 使用方法: 复制此文件为 .env 并修改具体值
+# cp .env.example .env
+# ==============================================
+
+# === 端口配置 ===
+# SSH 连接端口 (宿主机)
+SSH_PORT=2222
+# Web 应用端口 (宿主机)
+APP_PORT=9090
+
+# === 路径配置 ===
+# 项目源码挂载路径 (本地路径)
+PROJECT_DIR=/workspace
+
+# === 镜像信息 ===
+IMAGE_NAME=maven-java21-bun-dev
+IMAGE_TAG=1.0
+CONTAINER_NAME=maven-devcontainer