cdrop — 跨 OS 剪贴板与文件传输服务

Commilitia Drop：自托管的跨设备剪贴板同步与点对点文件传输。

- 后端 Go（chi / SQLite WAL / SSE Hub / WebRTC signaling + 状态机 / Relay ring buffer），编译进单个 distroless 镜像（前端 go:embed）。
- 前端 React + TanStack Router + Zustand，自实现 SSE + WebRTC P2P，NAT 受阻时回退服务端中继；聚珍（Juzhen）CJK 综合排版。
- 桌面端 Wails v2（macOS / Windows），瘦客户端复用 web。
- 鉴权 OIDC PKCE（自建 Casdoor 等），refresh_token 信封加密存系统密钥库；iOS Shortcut 用 HS256 scoped token。

架构文档与变更记录见 docs 分支（PROJECT_BRIEF / FRONTEND_DESIGN / CHANGELOG）。

本次为公开发布初始提交：完整开发历史（含部署细节）留存于私有归档，公开仓库自此干净起步。

desktop/platform/launchagent_windows.go

@@ -0,0 +1,53 @@
+//go:build windows
+
+package platform
+
+import (
+	"errors"
+	"os"
+
+	"golang.org/x/sys/windows/registry"
+)
+
+const (
+	// runKeyPath is the per-user autostart key — entries here launch at sign-in
+	// without elevation (HKLM would need admin).
+	runKeyPath   = `Software\Microsoft\Windows\CurrentVersion\Run`
+	runValueName = "Commilitia Drop"
+)
+
+// SetLaunchAtLogin adds or removes the per-user Run registry entry that starts
+// the app at sign-in. The value is the quoted executable path (so a Program
+// Files path with spaces stays one argument) followed by --hidden, so a login
+// launch comes up to the tray with no window (see launchedHidden in main).
+func SetLaunchAtLogin(enabled bool) error {
+	k, _, err := registry.CreateKey(registry.CURRENT_USER, runKeyPath, registry.SET_VALUE)
+	if err != nil {
+		return err
+	}
+	defer k.Close()
+
+	if !enabled {
+		if err := k.DeleteValue(runValueName); err != nil && !errors.Is(err, registry.ErrNotExist) {
+			return err
+		}
+		return nil
+	}
+
+	exe, err := os.Executable()
+	if err != nil {
+		return err
+	}
+	return k.SetStringValue(runValueName, `"`+exe+`" --hidden`)
+}
+
+// IsLaunchAtLoginEnabled reports whether the Run entry is present.
+func IsLaunchAtLoginEnabled() bool {
+	k, err := registry.OpenKey(registry.CURRENT_USER, runKeyPath, registry.QUERY_VALUE)
+	if err != nil {
+		return false
+	}
+	defer k.Close()
+	_, _, err = k.GetStringValue(runValueName)
+	return err == nil
+}