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*

pkg/mdprint/inline.go

@@ -0,0 +1,91 @@
+package mdprint
+
+func parseInline(text string) []Node {
+	var nodes []Node
+	runes := []rune(text)
+	i := 0
+
+	for i < len(runes) {
+		rem := string(runes[i:])
+
+		if len(rem) >= 2 && rem[:2] == "**" {
+			end := findDelim(runes, i+2, "**")
+			if end >= 0 {
+				inner := string(runes[i+2 : end])
+				nodes = append(nodes, Bold{Content: parseInline(inner)})
+				i = end + 2
+				continue
+			}
+			nodes = append(nodes, Text{Text: "**"})
+			i += 2
+			continue
+		}
+
+		if len(rem) >= 1 && rem[:1] == "*" {
+			end := findDelim(runes, i+1, "*")
+			if end >= 0 {
+				inner := string(runes[i+1 : end])
+				nodes = append(nodes, Italic{Content: parseInline(inner)})
+				i = end + 1
+				continue
+			}
+			nodes = append(nodes, Text{Text: "*"})
+			i++
+			continue
+		}
+
+		if len(rem) >= 1 && rem[:1] == "`" {
+			end := findDelim(runes, i+1, "`")
+			if end >= 0 {
+				nodes = append(nodes, Code{Text: string(runes[i+1 : end])})
+				i = end + 1
+				continue
+			}
+			nodes = append(nodes, Text{Text: "`"})
+			i++
+			continue
+		}
+
+		if len(rem) >= 1 && rem[:1] == "[" {
+			closeB := findDelim(runes, i+1, "]")
+			if closeB >= 0 && closeB+1 < len(runes) && runes[closeB+1] == '(' {
+				closeP := findDelim(runes, closeB+2, ")")
+				if closeP >= 0 {
+					linkText := string(runes[i+1 : closeB])
+					url := string(runes[closeB+2 : closeP])
+					nodes = append(nodes, Link{Content: parseInline(linkText), URL: url})
+					i = closeP + 1
+					continue
+				}
+			}
+		}
+
+		textStart := i
+		for i < len(runes) {
+			ch := string(runes[i])
+			if ch == "*" || ch == "`" || ch == "[" {
+				break
+			}
+			if ch == "\\" && i+1 < len(runes) {
+				i += 2
+				continue
+			}
+			i++
+		}
+		if i > textStart {
+			nodes = append(nodes, Text{Text: string(runes[textStart:i])})
+		}
+	}
+
+	return nodes
+}
+
+func findDelim(runes []rune, start int, delim string) int {
+	for j := start; j < len(runes); j++ {
+		rem := string(runes[j:])
+		if len(rem) >= len(delim) && rem[:len(delim)] == delim {
+			return j
+		}
+	}
+	return -1
+}