feat(proxy-route): allow disabling HTTP/2 per route

internal/apps/openflare/config_version/snapshot.go

@@ -50,6 +50,7 @@ type snapshotRoute struct {
 	Upstreams          []string                         `json:"upstreams,omitempty"`
 	Enabled            bool                             `json:"enabled"`
 	EnableHTTPS        bool                             `json:"enable_https"`
+	EnableHTTP2        bool                             `json:"enable_http2"`
 	DomainCertIDs      []uint                           `json:"domain_cert_ids,omitempty"`
 	RedirectHTTP       bool                             `json:"redirect_http"`
 	LimitConnPerServer int                              `json:"limit_conn_per_server,omitempty"`
@@ -288,6 +289,7 @@ func buildSnapshotRoutes(ctx context.Context, routes []*model.ProxyRoute) ([]sna
 			Upstreams:          upstreams,
 			Enabled:            route.Enabled,
 			EnableHTTPS:        route.EnableHTTPS,
+			EnableHTTP2:        route.EnableHTTP2,
 			DomainCertIDs:      domainCertIDs,
 			RedirectHTTP:       route.RedirectHTTP,
 			LimitConnPerServer: route.LimitConnPerServer,