feat(merge): enhance type conflict detection for columns

* Introduced extractTypeParts function to handle embedded dimensions in type strings.
* Updated columnTypeConflict to utilize new type extraction logic.
* Improved PostgreSQL type normalization and handling in various components.

pkg/writers/pgsql/template_functions.go

@@ -5,6 +5,8 @@ import (
 	"regexp"
 	"strings"
 	"unicode"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/pgsql"
 )
 
 // TemplateFunctions returns a map of custom template functions
@@ -162,24 +164,12 @@ func quoteIdent(s string) string {
 
 // Type conversion functions
 
-// goTypeToSQL converts Go type to PostgreSQL type
+// goTypeToSQL converts Go type to PostgreSQL type using the shared pgsql type map.
 func goTypeToSQL(goType string) string {
-	typeMap := map[string]string{
-		"string":    "text",
-		"int":       "integer",
-		"int32":     "integer",
-		"int64":     "bigint",
-		"float32":   "real",
-		"float64":   "double precision",
-		"bool":      "boolean",
-		"time.Time": "timestamp",
-		"[]byte":    "bytea",
-	}
-
-	if sqlType, ok := typeMap[goType]; ok {
+	if sqlType, ok := pgsql.GoToPGSQLTypes[goType]; ok {
 		return sqlType
 	}
-	return "text" // Default
+	return "text"
 }
 
 // sqlTypeToGo converts PostgreSQL type to Go type