Initial Navis client with NaiveProxy, profiles, ping and git updates

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/core/engine.go

@@ -0,0 +1,28 @@
+package core
+
+import (
+	"context"
+
+	"vpnclient/internal/config"
+)
+
+// Engine runs one protocol backend (e.g. official naive.exe).
+type Engine interface {
+	Protocol() config.Protocol
+	Start(ctx context.Context, profile config.Profile, binDir string) error
+	Stop() error
+	Running() bool
+	LocalHTTPProxy() (hostPort string, ok bool)
+	LocalSOCKSProxy() (hostPort string, ok bool)
+}
+
+// Status is a snapshot of the connection manager.
+type Status struct {
+	Connected   bool              `json:"connected"`
+	Profile     string            `json:"profile,omitempty"`
+	Protocol    config.Protocol   `json:"protocol,omitempty"`
+	HTTPProxy   string            `json:"http_proxy,omitempty"`
+	SOCKSProxy  string            `json:"socks_proxy,omitempty"`
+	SystemProxy bool              `json:"system_proxy"`
+	Extra       map[string]string `json:"extra,omitempty"`
+}