refactor: 目录结构重构和清理 (v2.0.2)

新增目录:
- docs/legacy/ - 废弃文档归档
- scripts/ - 管理脚本和测试脚本
- build/ - 构建输出目录

文件移动:
- GO_REFACTOR_PROGRESS.md -> docs/legacy/
- OPTIMIZATION_REPORT.md -> docs/legacy/
- sms-receiver-go-ctl.sh -> scripts/
- test_api.sh -> scripts/

改进:
- 更新 .gitignore 忽略运行时文件
- 新增 CHANGELOG.md 独立变更日志
- 更新 README.md 目录结构说明
- 更新 Makefile 版本号到 v2.0.2
- 更新管理脚本路径引用

清理:
- 从仓库中移除二进制文件
- 从仓库中移除数据库文件
- 从仓库中移除日志文件
- 从仓库中移除配置文件

scripts/.gitkeep

@@ -0,0 +1 @@
+# 脚本目录

scripts/sms-receiver-go-ctl.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+# SMS Receiver Go - 管理脚本
+
+SERVICE_NAME="sms-receiver-go"
+# 脚本所在目录的父目录（项目根目录）
+SCRIPT_DIR=$(cd "$(dirname "$0")/.." && pwd)
+BINARY_NAME="sms-receiver-v2"
+BINARY_PATH="$SCRIPT_DIR/$BINARY_NAME"
+LOG_PATH="$SCRIPT_DIR/sms_receiver.log"
+
+case "$1" in
+    start)
+        echo "启动 SMS Receiver Go 服务..."
+        systemctl start $SERVICE_NAME
+        sleep 2
+        systemctl status $SERVICE_NAME --no-pager
+        ;;
+    stop)
+        echo "停止 SMS Receiver Go 服务..."
+        systemctl stop $SERVICE_NAME
+        ;;
+    restart)
+        echo "重启 SMS Receiver Go 服务..."
+        systemctl restart $SERVICE_NAME
+        sleep 2
+        systemctl status $SERVICE_NAME --no-pager
+        ;;
+    status)
+        echo "SMS Receiver Go 服务状态:"
+        systemctl status $SERVICE_NAME --no-pager
+        ;;
+    log)
+        echo "SMS Receiver Go 日志 (最近 50 行):"
+        if [ -f "$LOG_PATH" ]; then
+            tail -n 50 "$LOG_PATH"
+        else
+            echo "日志文件不存在: $LOG_PATH"
+        fi
+        ;;
+    logtail)
+        echo "实时监控 SMS Receiver Go 日志 (Ctrl+C 退出):"
+        if [ -f "$LOG_PATH" ]; then
+            tail -f "$LOG_PATH"
+        else
+            echo "日志文件不存在: $LOG_PATH"
+        fi
+        ;;
+    enable)
+        echo "设置 SMS Receiver Go 开机自启..."
+        systemctl enable $SERVICE_NAME
+        ;;
+    disable)
+        echo "禁用 SMS Receiver Go 开机自启..."
+        systemctl disable $SERVICE_NAME
+        ;;
+    *)
+        echo "用法: $0 {start|stop|restart|status|log|logtail|enable|disable}"
+        echo ""
+        echo "命令说明:"
+        echo "  start    - 启动服务"
+        echo "  stop     - 停止服务"
+        echo "  restart  - 重启服务"
+        echo "  status   - 查看状态"
+        echo "  log      - 查看日志"
+        echo "  logtail  - 实时监控日志"
+        echo "  enable   - 设置开机自启"
+        echo "  disable  - 禁用开机自启"
+        exit 1
+        ;;
+esac
+
+exit 0

scripts/test_api.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# 测试 Go 版本 API
+
+echo "测试 API /api/messages..."
+curl -s http://127.0.0.1:28001/api/messages | python3 -m json.tool | head -30
+
+echo -e "\n\n测试 API /api/statistics..."
+curl -s http://127.0.0.1:28001/api/statistics | python3 -m json.tool
+
+echo -e "\n\n测试首页 / (先登录获取 cookie)"
+# 这里需要手动登录测试