refactor: 项目结构重组，src/ 扁平化为根目录，提取 pkg/ 子包

- 模块名重命名 yunshu -> hub.gaomia.site/titor/YunShu
- Go 版本升级 1.21 -> 1.25
- src/ 目录删除，所有文件移至根目录
- 新增 pkg/mdprint/: Markdown AST 解析+ANSI 渲染
- 新增 pkg/style/: 终端颜色样式（8色 ANSI + 24位真彩色）
- 新增 pkg/termui/: 终端输入组件（交互式输入/密码/确认）
- 更新文档：AGENTS.md、architecture.md、changelog.md、taolun.md
- gitignore 通配符修复 yunshu.exe -> yunshu.exe*

main.go

@@ -0,0 +1,146 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"syscall"
+
+	"hub.gaomia.site/titor/YunShu/pkg/style"
+	"hub.gaomia.site/titor/YunShu/pkg/termui"
+)
+
+const version = "1.0.0"
+
+func init() {
+	kernel32 := syscall.NewLazyDLL("kernel32.dll")
+	setConsoleCP := kernel32.NewProc("SetConsoleOutputCP")
+	setConsoleCP.Call(65001)
+}
+
+func printHelp() {
+	fmt.Println()
+	fmt.Println(style.Cyan.Render("☁ 云枢·Agent"), style.Dim.Render("v"+version))
+	fmt.Println()
+	fmt.Println(style.Bold.Render("用法:"))
+	fmt.Println("  yunshu [命令] [查询内容]")
+	fmt.Println()
+	fmt.Println(style.Bold.Render("命令:"))
+	fmt.Println("  onboard       交互式初始化配置")
+	fmt.Println("  help, -h      显示帮助信息")
+	fmt.Println("  version, -v   显示版本号")
+	fmt.Println()
+	fmt.Println(style.Bold.Render("示例:"))
+	fmt.Println("  yunshu \"北京今天天气\"   ", style.Dim.Render("单次天气查询"))
+	fmt.Println("  yunshu                 ", style.Dim.Render("启动交互模式"))
+	fmt.Println("  yunshu onboard         ", style.Dim.Render("重新初始化配置"))
+	fmt.Println()
+	fmt.Println(style.Bold.Render("环境变量:"))
+	fmt.Println("  LLM_API_KEY     API Key（优先级高于配置文件）")
+	fmt.Println("  LLM_ENDPOINT    API 端点")
+	fmt.Println("  LLM_MODEL       模型名")
+	fmt.Println()
+	fmt.Println(style.Bold.Render("配置文件:"), "~/.config/yunshu/config.yaml")
+	fmt.Println()
+}
+
+func printVersion() {
+	fmt.Println("yunshu", version)
+}
+
+func main() {
+	args := os.Args[1:]
+
+	if len(args) > 0 {
+		switch args[0] {
+		case "onboard":
+			runOnboard()
+			return
+		case "help", "--help", "-h":
+			printHelp()
+			return
+		case "version", "--version", "-v":
+			printVersion()
+			return
+		default:
+			if strings.HasPrefix(args[0], "-") {
+				fmt.Fprintln(os.Stderr, style.Red.Render("未知选项: "+args[0]))
+				fmt.Fprintln(os.Stderr, "可用命令: onboard, help, version")
+				os.Exit(1)
+			}
+		}
+	}
+
+	cfg, err := LoadConfig()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, style.Red.Render("未找到配置文件。请先运行:"))
+		fmt.Fprintln(os.Stderr, "  yunshu onboard")
+		os.Exit(1)
+	}
+	_ = cfg
+
+	GenerateToolsYAML()
+
+	agentPath := SearchFile("agents/weather-agent.md")
+	def, err := LoadAgent(agentPath)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, style.Red.Render("加载 agent 失败: "+err.Error()))
+		os.Exit(1)
+	}
+
+	if len(args) > 0 {
+		ClearSession()
+		query := strings.Join(args, " ")
+		if err := RunAgent(def, query); err != nil {
+			fmt.Fprintln(os.Stderr, style.Red.Render("错误: "+err.Error()))
+			os.Exit(1)
+		}
+		return
+	}
+
+	fmt.Println()
+	fmt.Println(style.Cyan.Render("☁ 云枢·Agent"), style.Dim.Render("· 天气情报官"))
+	fmt.Println(style.Dim.Render("  /exit 退出，// 开头的行不发给 LLM"))
+	fmt.Println()
+	ClearSession()
+
+	for {
+		fmt.Print(style.Cyan.Render("❯ "))
+		input := termui.ReadLine()
+		input = strings.TrimSpace(input)
+		if input == "" {
+			continue
+		}
+
+		if strings.HasPrefix(input, "//") {
+			continue
+		}
+
+		switch input {
+		case "/exit", "exit", "quit":
+			fmt.Println("再见！")
+			fmt.Println()
+			return
+		case "/clear":
+			ClearSession()
+			fmt.Print("\033[2J\033[H")
+			fmt.Println(style.Dim.Render("会话已清空"))
+			fmt.Println()
+			continue
+		case "/help":
+			fmt.Println("可用命令:")
+			fmt.Println("  /exit   退出")
+			fmt.Println("  /clear  清空会话")
+			fmt.Println("  /help   显示帮助")
+			fmt.Println("  //      不发给 LLM 的注释行")
+			fmt.Println()
+			continue
+		}
+
+		if err := RunAgent(def, input); err != nil {
+			fmt.Fprintln(os.Stderr, style.Red.Render("错误: "+err.Error()))
+		}
+		fmt.Println()
+	}
+}
+