refactor: merge retry target type into http (max_retries=0 = fire-and-forget)

internal/database/model_target.go

@@ -5,7 +5,6 @@ type TargetType string
 
 const (
 	TargetTypeHTTP     TargetType = "http"
-	TargetTypeRetry    TargetType = "retry"
 	TargetTypeDatabase TargetType = "database"
 	TargetTypeLog      TargetType = "log"
 )
@@ -22,7 +21,7 @@ type Target struct {
 	// Configuration fields (JSON stored based on type)
 	Config string `gorm:"type:text" json:"config"` // JSON configuration
 
-	// For retry targets
+	// For HTTP targets (max_retries=0 means fire-and-forget, >0 enables retries with backoff)
 	MaxRetries   int `json:"max_retries,omitempty"`
 	MaxQueueSize int `json:"max_queue_size,omitempty"`