Keep each model's parent out of its JSON (closes #177)

Every reference from a model to the record it belongs to is now
json:"-", so the webhook and target models (and the other parent and
child pairs in internal/database) can no longer marshal each other in
a loop. Preloading maps associations without reading json tags, so it
still fills these references. One test preloads a webhook with its
targets and entrypoints and a target with its webhook, checks the
references are filled, and checks the JSON leaves them out; another
builds each other model with its parent set and checks the parent's
id is absent from its JSON.

Model: opus-5-5

internal/database/model_delivery_result.go

@@ -23,6 +23,7 @@ type DeliveryResult struct {
 	Error        string `json:"error,omitempty"`
 	Duration     int64  `json:"durationMs"` // Duration in milliseconds
 
-	// Relations
-	Delivery Delivery `json:"delivery,omitzero"`
+	// Relations. No model marshals the record it belongs to:
+	// Delivery.DeliveryResults leads back here, and the JSON could loop.
+	Delivery Delivery `json:"-"`
 }