feat: Logo模块化与渐变色统一

- 修复 --help/-h/-?/--version 在交互模式下无响应的问题
- 新增 internal/logo/logo.go 统一管理logo展示
- 新增 build.sh 自动注入git版本号
- TUI头部与CLI使用统一logo模块
- 移除TUI头部的 [Ctrl+C 退出] 显示
- 统一版本号格式: ( v1.1.1-dirty )

internal/logo/logo.go

@@ -0,0 +1,79 @@
+package logo
+
+import (
+	"fmt"
+	"strings"
+)
+
+var version string
+
+func SetVersion(v string) { version = v }
+
+func GetVersion() string { return version }
+
+func GradientText(text string, startColor, endColor string) string {
+	startR, startG, startB := parseHexColor(startColor)
+	endR, endG, endB := parseHexColor(endColor)
+
+	lines := strings.Split(text, "\n")
+	if len(lines) == 0 {
+		return text
+	}
+
+	var result []string
+	for _, line := range lines {
+		if len(line) == 0 {
+			result = append(result, line)
+			continue
+		}
+
+		var coloredLine string
+		for i, char := range line {
+			ratio := float64(i) / float64(len(line)-1)
+			r := int(float64(startR) + float64(endR-startR)*ratio)
+			g := int(float64(startG) + float64(endG-startG)*ratio)
+			b := int(float64(startB) + float64(endB-startB)*ratio)
+			coloredLine += fmt.Sprintf("\033[38;2;%d;%d;%dm%s\033[0m", r, g, b, string(char))
+		}
+		result = append(result, coloredLine)
+	}
+
+	return strings.Join(result, "\n")
+}
+
+func parseHexColor(hex string) (int, int, int) {
+	hex = strings.TrimPrefix(hex, "#")
+	if len(hex) != 6 {
+		return 0, 0, 0
+	}
+	var r, g, b int
+	fmt.Sscanf(hex, "%02x%02x%02x", &r, &g, &b)
+	return r, g, b
+}
+
+func GetLogoPattern() string {
+	return " _  _ _____ _____    " + "\n" +
+		"( \\/ (  _  (  _  )   " + "\n" +
+		" \\  / )(_)( )(_)(    " + "\n" +
+		" (__)(_____(_____("
+}
+
+func GetVersionSuffix() string {
+	v := GetVersion()
+	if v != "" {
+		return " (" + v + " )"
+	}
+	return " ( )"
+}
+
+func PrintLogoWithVersion() {
+	logoPattern := " _  _ _____ _____\n" +
+		"( \\/ (  _  (  _  )\n" +
+		" \\  / )(_)( )(_)( \n" +
+		" (__)(_____(_____("
+
+	patternWithVersion := logoPattern + GetVersionSuffix()
+
+	colored := GradientText(patternWithVersion, "#B413DC", "#00C8C8")
+	fmt.Println(colored)
+}