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/tui/model.go

@@ -13,17 +13,12 @@ import (
 	"charm.land/bubbletea/v2"
 	"charm.land/lipgloss/v2"
 	"github.com/titor/fanyi/internal/config"
-	"github.com/titor/fanyi/internal/content"
+	"github.com/titor/fanyi/internal/logo"
 	"github.com/titor/fanyi/internal/translator"
 )
 
 var supportedLangs = []string{"zh-CN", "en-US", "ja", "ko", "zh-TW", "es", "fr", "de"}
 
-var logoPattern = "l_  _ _____ _____    " + "\n" +
-	"( \\/ (  _  (  _  )   " + "\n" +
-	" \\  / )(_)( )(_)(    " + "\n" +
-	" (__)(_____(_____((() [v" + content.Version + "]"
-
 type translateMsg struct {
 	result string
 	tokens int
@@ -312,59 +307,18 @@ func (m model) View() tea.View {
 	return v
 }
 
-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, "#")
-	r, _ := strconv.ParseInt(hex[0:2], 16, 64)
-	g, _ := strconv.ParseInt(hex[2:4], 16, 64)
-	b, _ := strconv.ParseInt(hex[4:6], 16, 64)
-	return int(r), int(g), int(b)
-}
-
 func (m model) renderHeader() string {
-	title := gradientText(logoPattern, "#8B5CF6", "#EC4899")
+	title := logo.GradientText(logo.GetLogoPattern(), "#B413DC", "#00C8C8")
+	titleWithVersion := title + logo.GetVersionSuffix()
 
 	width := m.width - 4
 	if width < 20 {
 		width = 60
 	}
 
-	right := lipgloss.NewStyle().
-		Foreground(lipgloss.Color("#6B7280")).
-		Render("[Ctrl+C 退出]")
-
 	return lipgloss.NewStyle().
 		Width(width).
-		Render(title + strings.Repeat(" ", width-29-len(right)-1) + right)
+		Render(titleWithVersion)
 }
 
 func (m model) renderInputArea() string {