feat(site): 并入 Gin 官网与文档服务，对齐桌面产品形态

- apps/server：Gin embed 官网 + /docs + /health + /download（无操作 API）
- run.sh 重写 web/gui 场景；.gitignore 排除 server 二进制与挂载的安装包
- README/AGENTS/CLAUDE 同步「浏览器只看官网、操作走桌面」的产品形态说明
- 终端视口背景变量与全宽终端边缘 hairline 修正（serial/terminal/i18n 微调）

apps/server/internal/site/site.go

@@ -0,0 +1,63 @@
+// Package site 提供产品官网（嵌入 HTML/CSS/JS）。
+package site
+
+import (
+	"embed"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+//go:embed template.html assets
+var files embed.FS
+
+type Handler struct {
+	html string
+}
+
+func New() *Handler {
+	raw, err := files.ReadFile("template.html")
+	if err != nil {
+		panic("site: template.html 缺失: " + err.Error())
+	}
+	return &Handler{html: string(raw)}
+}
+
+func (h *Handler) Register(r *gin.Engine) {
+	r.GET("/", h.Page)
+	r.GET("/home", h.Page)
+	r.GET("/index.html", h.Page)
+	r.GET("/site/assets/*file", h.Asset)
+}
+
+func (h *Handler) Page(c *gin.Context) {
+	c.Header("Content-Type", "text/html; charset=utf-8")
+	c.Header("Cache-Control", "no-cache")
+	_, _ = c.Writer.WriteString(h.html)
+}
+
+func (h *Handler) Asset(c *gin.Context) {
+	name := strings.TrimPrefix(c.Param("file"), "/")
+	if strings.Contains(name, "..") {
+		c.Status(http.StatusBadRequest)
+		return
+	}
+	data, err := files.ReadFile("assets/" + name)
+	if err != nil {
+		c.Status(http.StatusNotFound)
+		return
+	}
+	switch {
+	case strings.HasSuffix(name, ".css"):
+		c.Header("Content-Type", "text/css; charset=utf-8")
+	case strings.HasSuffix(name, ".js"):
+		c.Header("Content-Type", "application/javascript; charset=utf-8")
+	case strings.HasSuffix(name, ".svg"):
+		c.Header("Content-Type", "image/svg+xml")
+	default:
+		c.Header("Content-Type", "application/octet-stream")
+	}
+	c.Header("Cache-Control", "public, max-age=3600")
+	c.Data(http.StatusOK, "", data)
+}