feat(ui): 🎨 Implement schema and table management screens

* Add schema management screen with list and editor
* Implement table management screen with list and editor
* Create data operations for schema and table management
* Define UI rules and guidelines for consistency
* Ensure circular tab navigation and keyboard shortcuts
* Add forms for creating and editing schemas and tables
* Implement confirmation dialogs for destructive actions

pkg/ui/domain_dataops.go

@@ -0,0 +1,35 @@
+package ui
+
+import (
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// createDomain creates a new domain
+func (se *SchemaEditor) createDomain(name, description string) {
+	domain := &models.Domain{
+		Name:        name,
+		Description: description,
+		Tables:      make([]*models.DomainTable, 0),
+		Sequence:    uint(len(se.db.Domains)),
+	}
+
+	se.db.Domains = append(se.db.Domains, domain)
+	se.showDomainList()
+}
+
+// updateDomain updates an existing domain
+func (se *SchemaEditor) updateDomain(index int, name, description string) {
+	if index >= 0 && index < len(se.db.Domains) {
+		se.db.Domains[index].Name = name
+		se.db.Domains[index].Description = description
+		se.showDomainList()
+	}
+}
+
+// deleteDomain deletes a domain by index
+func (se *SchemaEditor) deleteDomain(index int) {
+	if index >= 0 && index < len(se.db.Domains) {
+		se.db.Domains = append(se.db.Domains[:index], se.db.Domains[index+1:]...)
+		se.showDomainList()
+	}
+}