Add Arrtrix runtime, config, onboarding, and webhook support

- Implement runtime package for bridge startup, config loading, and env
  overrides
- Add onboarding package for management room welcome messages
- Add matrixcmd package for command processing and help
- Add webhook package with Radarr webhook support and validation
- Extend connector config for webhooks and validation
- Update default config and example config for new options
- Add tests for new packages and config validation
- Change database type default to sqlite3-fk-wal

packages/arrtrix/pkg/matrixcmd/help_test.go

@@ -0,0 +1,42 @@
+package matrixcmd
+
+import (
+	"strings"
+	"testing"
+
+	"maunium.net/go/mautrix/bridgev2"
+	"maunium.net/go/mautrix/bridgev2/bridgeconfig"
+	"maunium.net/go/mautrix/bridgev2/database"
+	"maunium.net/go/mautrix/id"
+)
+
+func TestFormatHelpManagementRoom(t *testing.T) {
+	roomID := id.RoomID("!arrtrix:test")
+	proc := &Processor{
+		texts:   bridgeconfig.ManagementRoomTexts{AdditionalHelp: "Extra help text."},
+		command: make(map[string]Handler),
+		alias:   make(map[string]string),
+	}
+	proc.Add(NewHelpHandler(proc))
+
+	out := formatHelp(proc, &Context{
+		Bridge: &bridgev2.Bridge{
+			Config: &bridgeconfig.BridgeConfig{
+				CommandPrefix: "!arr",
+			},
+		},
+		RoomID:    roomID,
+		User:      &bridgev2.User{User: &database.User{ManagementRoom: roomID}},
+		Processor: proc,
+	})
+
+	for _, fragment := range []string{
+		"prefixing commands with `!arr` is not required",
+		"**help** - Show this help message.",
+		"Extra help text.",
+	} {
+		if !strings.Contains(out, fragment) {
+			t.Fatalf("expected help output to contain %q, got:\n%s", fragment, out)
+		}
+	}
+}