List the missing channel modes in the 004 reply (closes #238)

The channel-modes parameter of RPL_MYINFO left out modes that each
transport's MODE accepts. The IRC listener now sends Himnostv, adding
H, i, o and v. The HTTP API now sends Hbiklmnostv, adding H, b and v.
Each transport keeps its own list, because they accept different
modes. The tests compare the whole parameter, so a missing or extra
mode fails them. The README and the schema notes show the new HTTP API
list.

Model: opus-5-5

internal/ircserver/server_test.go

@@ -10,6 +10,7 @@ import (
 	"net"
 	"os"
 	"runtime"
+	"slices"
 	"strings"
 	"sync/atomic"
 	"testing"
@@ -486,20 +487,20 @@ func TestWelcomeContainsNick(t *testing.T) {
 	}
 }
 
-// TestMyInfoListsUserModes checks that RPL_MYINFO lists the
-// user modes o and w, with no empty parameter before the
-// channel modes.
-func TestMyInfoListsUserModes(t *testing.T) {
+// TestMyInfoListsModes checks that RPL_MYINFO lists the user
+// modes o and w, then the channel modes MODE accepts on the
+// IRC listener. It compares the whole line, so a missing or
+// extra mode fails it.
+func TestMyInfoListsModes(t *testing.T) {
 	t.Parallel()
 
 	env := newTestEnv(t)
 	lines := env.dial(t).register("carol")
 
-	assertContains(
-		t, lines,
-		":test.irc 004 carol test.irc neoirc ow mnst",
-		"RPL_MYINFO with user modes",
-	)
+	want := ":test.irc 004 carol test.irc neoirc ow Himnostv"
+	if !slices.Contains(lines, want) {
+		t.Errorf("no line %q in %v", want, lines)
+	}
 }
 
 func TestPingPong(t *testing.T) {