Use a typed escalation fallback instead of fallbackTopic

TerdutTeam spec.escalation.fallback is now {type, address}, mirroring the
server's notification channel model. CRDs regenerated.

Claude-Session: https://claude.ai/code/session_016mBLURvJoMuUEr9cB2RpUN

internal/controller/terdutteam_config.go

@@ -55,10 +55,14 @@ func buildEscalationRequest(spec *terdutv1alpha1.EscalationSpec) (tdclient.SetEs
 			Targets:        targets,
 		}
 	}
+	var fallback tdclient.NotificationTarget
+	if spec.Fallback != nil {
+		fallback = tdclient.NotificationTarget{Type: spec.Fallback.Type, Address: spec.Fallback.Address}
+	}
 	return tdclient.SetEscalationRequest{
-		RepeatCount:   spec.RepeatCount,
-		FallbackTopic: spec.FallbackTopic,
-		Levels:        levels,
+		RepeatCount: spec.RepeatCount,
+		Fallback:    fallback,
+		Levels:      levels,
 	}, nil
 }
 

internal/controller/terdutteam_controller_test.go

@@ -300,7 +300,7 @@ var _ = Describe("TerdutTeam Controller", func() {
 	Describe("spec.escalation", func() {
 		ladder := func() *terdutv1alpha1.EscalationSpec {
 			return &terdutv1alpha1.EscalationSpec{
-				RepeatCount: 2, FallbackTopic: "oncall",
+				RepeatCount: 2, Fallback: &terdutv1alpha1.NotificationTarget{Type: "ntfy", Address: "oncall"},
 				Levels: []terdutv1alpha1.EscalationLevel{
 					{Timeout: "5m", Targets: []terdutv1alpha1.EscalationTarget{{Kind: terdutv1alpha1.EscalationTargetOncall}}},
 					{Timeout: "15m", Targets: []terdutv1alpha1.EscalationTarget{{Kind: terdutv1alpha1.EscalationTargetUser, Username: "alice"}}},
@@ -320,7 +320,7 @@ var _ = Describe("TerdutTeam Controller", func() {
 
 			got := fake.escalation[getTeam(ctx).Status.TeamID]
 			Expect(got.RepeatCount).To(Equal(int64(2)))
-			Expect(got.FallbackTopic).To(Equal("oncall"))
+			Expect(got.Fallback).To(Equal(tdclient.NotificationTarget{Type: "ntfy", Address: "oncall"}))
 			Expect(got.Levels).To(HaveLen(2))
 			Expect(got.Levels[0].TimeoutSeconds).To(Equal(int64(300)))
 			Expect(got.Levels[1].Targets[0]).To(Equal(tdclient.EscalationTargetRequest{Kind: "user", Username: "alice"}))

internal/tdclient/client.go

@@ -208,10 +208,17 @@ type EscalationLevelRequest struct {
 	Targets        []EscalationTargetRequest `json:"targets"`
 }
 
+// NotificationTarget is a notification provider and an address it understands.
+// Both empty means none.
+type NotificationTarget struct {
+	Type    string `json:"type"`
+	Address string `json:"address"`
+}
+
 type SetEscalationRequest struct {
-	RepeatCount   int64                    `json:"repeat_count"`
-	FallbackTopic string                   `json:"fallback_topic"`
-	Levels        []EscalationLevelRequest `json:"levels"`
+	RepeatCount int64                    `json:"repeat_count"`
+	Fallback    NotificationTarget       `json:"fallback"`
+	Levels      []EscalationLevelRequest `json:"levels"`
 }
 
 // SetEscalation calls PUT /api/teams/{teamID}/escalation -- an upsert