Add --version flag and display version on startup

gormcol.go

@@ -1,17 +1,3 @@
-// Package gormcol provides type-safe GORM column descriptors.
-//
-// This package enables defining struct-like variables that map Go field names
-// to database column names, allowing type-safe queries in GORM.
-//
-// Example usage:
-//
-//	var PsAccessCols = struct {
-//	    IDProfile           gormcol.Field
-//	    IDAuthorizationRole gormcol.Field
-//	}{
-//	    IDProfile:           gormcol.Field{}.Set((&PsAccess{}).TableName(), "id_profile"),
-//	    IDAuthorizationRole: gormcol.Field{}.Set((&PsAccess{}).TableName(), "id_authorization_role"),
-//	}
 package gormcol
 
 // Field represents a GORM column descriptor.
@@ -21,18 +7,25 @@ type Field struct {
 	column string // Database column name
 }
 
+// TabCol returns the fully qualified "table.column" reference.
 func (f Field) TabCol() string {
 	return f.table + "." + f.column
 }
 
+// Col returns the column name without table qualification.
 func (f Field) Col() string {
 	return f.column
 }
 
+// Tab returns the table name.
 func (f Field) Tab() string {
 	return f.table
 }
 
+// Set initializes a Field with the given table and column names.
+// Use with TableName() for type-safe initialization, e.g.:
+//
+//	Field{}.Set((&MyModel{}).TableName(), "column_name")
 func (f Field) Set(tab, field string) Field {
 	return Field{
 		table:  tab,