refactor: 整理项目根目录结构

整理内容:
- 删除 60+ 临时测试输出文件 (*.txt)
- 移动二进制文件到 bin/ 目录
- 移动 Shell 脚本到 scripts/ 目录
  - scripts/dev/: check_gitea.sh, check_sub2api.sh, run_tests.sh
  - scripts/deploy/: deploy_*.sh, simple_deploy.sh
  - scripts/ops/: fix_nginx.sh, fix_ssl.sh, install_docker.sh
  - scripts/test/: test_*.sh, test_*.bat
- 移动批处理文件到 scripts/
- 移动 Python 脚本到 tools/
- 清理临时日志文件

保留根目录必要文件:
- go.mod, go.sum, go.work
- Makefile, docker-compose.yml
- .env.example, .gitignore
- README.md, AGENTS.md, DEPLOY_GUIDE.md

验证: go build ./... && go test ./... 通过

scripts/check_project.bat

@@ -0,0 +1,40 @@
+@echo off
+echo ====================================
+echo Project Migration Quick Check
+echo ====================================
+echo.
+
+echo 1. Checking key files...
+if exist "D:\project\go.mod" echo [OK] go.mod
+if exist "D:\project\README.md" echo [OK] README.md
+if exist "D:\project\cmd\server\main.go" echo [OK] main.go
+if exist "D:\project\configs\config.yaml" echo [OK] config.yaml
+echo.
+
+echo 2. Checking Go environment...
+where go >nul 2>&1
+if %errorlevel% == 0 (
+    echo [OK] Go is installed
+    go version
+) else (
+    echo [ERROR] Go is not installed
+)
+echo.
+
+echo 3. Checking directories...
+if exist "D:\project\cmd" echo [OK] cmd\
+if exist "D:\project\internal" echo [OK] internal\
+if exist "D:\project\configs" echo [OK] configs\
+if exist "D:\project\docs" echo [OK] docs\
+echo.
+
+echo ====================================
+echo Quick check completed!
+echo ====================================
+echo.
+echo Next steps:
+echo 1. Read docs\migration\MIGRATION_CHECKLIST.md for full checklist
+echo 2. Read docs\plans\NEXT_STEPS.md for detailed instructions
+echo 3. If Go is installed, run: go build ./cmd/server
+echo.
+pause