chore: replace hack with tools and remove obsolete artifacts

- Rename hack/ to tools/ for formal naming
- Update plugin development and deployment script references
- Remove obsolete DESIGN/MILESTONE/PLAN docs now superseded by docs/
- Remove abandoned internal/onebot implementation
- Ignore stray local qq binary artifact

tools/plugin-dev/scaffold.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# HomeAgent 插件脚手架生成工具
+# 用法: ./scaffold.sh <plugin-name> [输出目录]
+# 示例: ./scaffold.sh myplugin ./plugins/myplugin
+
+NAME="${1:-}"
+OUTDIR="${2:-./plugins/$NAME}"
+
+if [ -z "$NAME" ]; then
+	echo "用法: $0 <plugin-name> [输出目录]"
+	echo "示例: $0 myplugin ./plugins/myplugin"
+	exit 1
+fi
+
+if [ -d "$OUTDIR" ]; then
+	echo "错误: 目标目录已存在: $OUTDIR"
+	exit 1
+fi
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+TEMPLATE_DIR="$SCRIPT_DIR/templates"
+
+mkdir -p "$OUTDIR"
+
+# 替换模板中的占位符
+sed -e "s/{{.Name}}/$NAME/g" \
+	-e "s/{{.Version}}/0.1.0/g" \
+	-e "s/{{.Description}}//g" \
+	-e "s/{{.Author}}//g" \
+	"$TEMPLATE_DIR/plugin.json.tmpl" > "$OUTDIR/plugin.json"
+
+cp "$TEMPLATE_DIR/plugin.go.tmpl" "$OUTDIR/plugin.go"
+cp "$TEMPLATE_DIR/Makefile.tmpl" "$OUTDIR/Makefile"
+cp "$TEMPLATE_DIR/gitignore.tmpl" "$OUTDIR/.gitignore"
+
+echo "✅ 插件脚手架已生成: $OUTDIR"
+echo ""
+echo "下一步:"
+echo "  1. 编辑 $OUTDIR/plugin.go 实现业务逻辑"
+echo "  2. 编辑 $OUTDIR/plugin.json 完善元信息"
+echo "  3. cd $OUTDIR && make          # 编译 plugin.so"
+echo "  4. make package                # 打包为 .hmap 分发包"
+echo "  5. 通过 WebUI 或 plugin_install 工具安装"