chore: 恢复旧布局基线（迁移改动丢失后重建，apps/packages 布局暂存）

server/internal/db/ident.go

@@ -0,0 +1,49 @@
+package db
+
+import "strings"
+
+// quoteMySQLIdent 反引号标识符转义:内部反引号加倍(“),与前端 sql.ts quoteIdent 对齐。
+func quoteMySQLIdent(s string) string {
+	return "`" + strings.ReplaceAll(s, "`", "``") + "`"
+}
+
+func quotePGIdent(s string) string {
+	return `"` + strings.ReplaceAll(s, `"`, `""`) + `"`
+}
+
+// quoteIdentFor 按驱动族引用标识符:mysql 反引号加倍、pg/sqlite 双引号加倍、
+// mssql 中括号加倍、oracle 沿用原名(大写约定)。
+func quoteIdentFor(driver, name string) string {
+	switch {
+	case isMySQLFamily(driver):
+		return quoteMySQLIdent(name)
+	case isMSSQL(driver):
+		return "[" + strings.ReplaceAll(name, "]", "]]") + "]"
+	case driverKey(driver) == "oracle":
+		return name
+	case driverKey(driver) == "sqlite":
+		return quoteSQLiteIdent(name)
+	default:
+		return quotePGIdent(name)
+	}
+}
+
+// quoteTableNameFor 引用表名(支持 schema.table 多段,oracle 除外沿用原名)。
+func quoteTableNameFor(driver, table string) string {
+	if driverKey(driver) == "oracle" {
+		return table
+	}
+	parts := strings.Split(table, ".")
+	for i := range parts {
+		parts[i] = quoteIdentFor(driver, parts[i])
+	}
+	return strings.Join(parts, ".")
+}
+
+func splitSchemaTable(name string) (schema, table string) {
+	name = strings.TrimSpace(name)
+	if i := strings.LastIndex(name, "."); i > 0 {
+		return name[:i], name[i+1:]
+	}
+	return "", name
+}