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/schema_dataops.go

@@ -0,0 +1,55 @@
+package ui
+
+import "git.warky.dev/wdevs/relspecgo/pkg/models"
+
+// Schema data operations - business logic for schema management
+
+// CreateSchema creates a new schema and adds it to the database
+func (se *SchemaEditor) CreateSchema(name, description string) *models.Schema {
+	newSchema := &models.Schema{
+		Name:        name,
+		Description: description,
+		Tables:      make([]*models.Table, 0),
+		Sequences:   make([]*models.Sequence, 0),
+		Enums:       make([]*models.Enum, 0),
+	}
+	se.db.UpdateDate()
+	se.db.Schemas = append(se.db.Schemas, newSchema)
+	return newSchema
+}
+
+// UpdateSchema updates an existing schema's properties
+func (se *SchemaEditor) UpdateSchema(schemaIndex int, name, owner, description string) {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return
+	}
+	se.db.UpdateDate()
+	schema := se.db.Schemas[schemaIndex]
+	schema.Name = name
+	schema.Owner = owner
+	schema.Description = description
+	schema.UpdateDate()
+}
+
+// DeleteSchema removes a schema from the database
+func (se *SchemaEditor) DeleteSchema(schemaIndex int) bool {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return false
+	}
+	se.db.UpdateDate()
+	se.db.Schemas = append(se.db.Schemas[:schemaIndex], se.db.Schemas[schemaIndex+1:]...)
+	return true
+}
+
+// GetSchema returns a schema by index
+func (se *SchemaEditor) GetSchema(schemaIndex int) *models.Schema {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return nil
+	}
+	return se.db.Schemas[schemaIndex]
+}
+
+// GetAllSchemas returns all schemas
+func (se *SchemaEditor) GetAllSchemas() []*models.Schema {
+	return se.db.Schemas
+}