p2: 120s write timeout and flags after the URL

WriteTimeout 30s was cutting digest mid-flight (queue+fetch+digest)
and tailscale then 502'd. 120s write, 90s handler deadline.
sift fetch URL --question now parses; extra positionals error.

internal/api/api_test.go

@@ -13,6 +13,7 @@ import (
 	"path/filepath"
 	"strings"
 	"testing"
+	"time"
 
 	"git.wntrmute.dev/kyle/sift/internal/auth"
 	"git.wntrmute.dev/kyle/sift/internal/fetch"
@@ -240,3 +241,11 @@ func TestJQTooLarge(t *testing.T) {
 		t.Fatalf("%d %s", rec.Code, rec.Body.String())
 	}
 }
+
+func TestHTTPServerWriteTimeout(t *testing.T) {
+	s := New("test", &guard.Guard{}, nil, nil, slog.New(slog.NewTextHandler(io.Discard, nil)))
+	hs := s.HTTPServer("127.0.0.1:0")
+	if hs.WriteTimeout != 120*time.Second {
+		t.Fatalf("WriteTimeout %s", hs.WriteTimeout)
+	}
+}