feat(database): ✨ Enhance Preload and Join functionality

* Introduce skipAutoDetect flag to prevent circular calls in PreloadRelation.
* Improve handling of long alias chains in PreloadRelation.
* Ensure JoinRelation uses PreloadRelation without causing recursion.
* Clear deferred preloads after execution to prevent re-execution.

feat(recursive_crud): ✨ Filter valid fields in nested CUD processing

* Add filterValidFields method to validate input data against model structure.
* Use reflection to ensure only valid fields are processed.

feat(reflection): ✨ Add utility to get valid JSON field names

* Implement GetValidJSONFieldNames to retrieve valid JSON field names from model.
* Enhance field validation during nested CUD operations.

fix(handler): 🐛 Adjust recursive preload depth limit

* Change recursive preload depth limit from 5 to 4 to prevent excessive recursion.

pkg/restheadspec/handler.go

@@ -883,7 +883,7 @@ func (h *Handler) applyPreloadWithRecursion(query common.SelectQuery, preload co
 	})
 
 	// Handle recursive preloading
-	if preload.Recursive && depth < 5 {
+	if preload.Recursive && depth < 4 {
 		logger.Debug("Applying recursive preload for %s at depth %d", preload.Relation, depth+1)
 
 		// For recursive relationships, we need to get the last part of the relation path