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

api/v1alpha1/terdutteam_types.go

@@ -94,6 +94,24 @@ type EscalationLevel struct {
 	Targets []EscalationTarget `json:"targets"`
 }
 
+// NotificationTarget is somewhere a page can go without belonging to a person:
+// a notification provider the server has configured, and an address that
+// provider understands.
+type NotificationTarget struct {
+	// type is the notification provider, e.g. "ntfy". The server refuses a
+	// provider it has not been configured with.
+	// +required
+	// +kubebuilder:validation:MinLength=1
+	// +kubebuilder:validation:MaxLength=32
+	Type string `json:"type"`
+
+	// address is where that provider delivers it: an ntfy topic, say.
+	// +required
+	// +kubebuilder:validation:MinLength=1
+	// +kubebuilder:validation:MaxLength=256
+	Address string `json:"address"`
+}
+
 // EscalationSpec is a team's escalation ladder.
 type EscalationSpec struct {
 	// +kubebuilder:validation:Minimum=0
@@ -101,8 +119,10 @@ type EscalationSpec struct {
 	// +optional
 	RepeatCount int64 `json:"repeatCount,omitempty"`
 
+	// fallback is paged once when the ladder has run out of levels and repeats.
+	// Omitted, the chain just ends there.
 	// +optional
-	FallbackTopic string `json:"fallbackTopic,omitempty"`
+	Fallback *NotificationTarget `json:"fallback,omitempty"`
 
 	// +required
 	// +kubebuilder:validation:MinItems=1

api/v1alpha1/zz_generated.deepcopy.go

@@ -110,6 +110,11 @@ func (in *EscalationLevel) DeepCopy() *EscalationLevel {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *EscalationSpec) DeepCopyInto(out *EscalationSpec) {
 	*out = *in
+	if in.Fallback != nil {
+		in, out := &in.Fallback, &out.Fallback
+		*out = new(NotificationTarget)
+		**out = **in
+	}
 	if in.Levels != nil {
 		in, out := &in.Levels, &out.Levels
 		*out = make([]EscalationLevel, len(*in))
@@ -189,6 +194,21 @@ func (in *NetworkingSpec) DeepCopy() *NetworkingSpec {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *NotificationTarget) DeepCopyInto(out *NotificationTarget) {
+	*out = *in
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NotificationTarget.
+func (in *NotificationTarget) DeepCopy() *NotificationTarget {
+	if in == nil {
+		return nil
+	}
+	out := new(NotificationTarget)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *NotifySpec) DeepCopyInto(out *NotifySpec) {
 	*out = *in