🐛 fix(kingbase): 统一金仓标识符引用策略

- 标识符处理：下沉 Kingbase 引用逻辑，普通小写 schema/table 不再强制双引号包裹
- 表操作修复：修复截断、清空、导入、导出等路径生成异常双引号 SQL
- 同步链路修复：统一数据同步、预览、迁移建表中的 Kingbase schema.table 拼接规则
- 自定义驱动兼容：补齐 kingbase8/kingbasees/kingbasev8 别名归一与写入路径处理
- 回归覆盖：新增 ldf_server.andon_events、转义引号、保留字和大小写标识符测试

internal/sync/sql_helpers.go

@@ -1,6 +1,10 @@
 package sync
 
-import "strings"
+import (
+	"strings"
+
+	"GoNavi-Wails/internal/db"
+)
 
 func normalizeSyncMode(mode string) string {
 	m := strings.ToLower(strings.TrimSpace(mode))
@@ -21,9 +25,11 @@ func quoteIdentByType(dbType string, ident string) string {
 		return ident
 	}
 
-	switch dbType {
+	switch normalizeMigrationDBType(dbType) {
 	case "mysql", "mariadb", "oceanbase", "diros", "sphinx", "clickhouse", "tdengine":
 		return "`" + strings.ReplaceAll(ident, "`", "``") + "`"
+	case "kingbase":
+		return db.QuoteKingbaseIdentifier(ident)
 	case "sqlserver":
 		escaped := strings.ReplaceAll(ident, "]", "]]")
 		return "[" + escaped + "]"
@@ -38,9 +44,21 @@ func quoteQualifiedIdentByType(dbType string, ident string) string {
 		return raw
 	}
 
+	normalizedType := normalizeMigrationDBType(dbType)
+	if normalizedType == "kingbase" {
+		schema, table := db.SplitKingbaseQualifiedName(raw)
+		if table == "" {
+			return quoteIdentByType(normalizedType, raw)
+		}
+		if schema == "" {
+			return quoteIdentByType(normalizedType, table)
+		}
+		return quoteIdentByType(normalizedType, schema) + "." + quoteIdentByType(normalizedType, table)
+	}
+
 	parts := strings.Split(raw, ".")
 	if len(parts) <= 1 {
-		return quoteIdentByType(dbType, raw)
+		return quoteIdentByType(normalizedType, raw)
 	}
 
 	quotedParts := make([]string, 0, len(parts))
@@ -49,11 +67,11 @@ func quoteQualifiedIdentByType(dbType string, ident string) string {
 		if part == "" {
 			continue
 		}
-		quotedParts = append(quotedParts, quoteIdentByType(dbType, part))
+		quotedParts = append(quotedParts, quoteIdentByType(normalizedType, part))
 	}
 
 	if len(quotedParts) == 0 {
-		return quoteIdentByType(dbType, raw)
+		return quoteIdentByType(normalizedType, raw)
 	}
 	return strings.Join(quotedParts, ".")
 }
@@ -65,6 +83,17 @@ func normalizeSchemaAndTable(dbType string, dbName string, tableName string) (st
 		return rawDB, rawTable
 	}
 
+	normalizedType := normalizeMigrationDBType(dbType)
+	if normalizedType == "kingbase" {
+		schema, table := db.SplitKingbaseQualifiedName(rawTable)
+		if schema != "" && table != "" {
+			return schema, table
+		}
+		if table != "" {
+			return "public", table
+		}
+	}
+
 	if parts := strings.SplitN(rawTable, ".", 2); len(parts) == 2 {
 		schema := strings.TrimSpace(parts[0])
 		table := strings.TrimSpace(parts[1])
@@ -73,7 +102,7 @@ func normalizeSchemaAndTable(dbType string, dbName string, tableName string) (st
 		}
 	}
 
-	switch strings.ToLower(strings.TrimSpace(dbType)) {
+	switch normalizedType {
 	case "postgres", "kingbase", "highgo", "vastbase", "opengauss":
 		return "public", rawTable
 	case "duckdb":
@@ -92,7 +121,7 @@ func qualifiedNameForQuery(dbType string, schema string, table string, original
 		return raw
 	}
 
-	switch strings.ToLower(strings.TrimSpace(dbType)) {
+	switch normalizeMigrationDBType(dbType) {
 	case "postgres", "kingbase", "highgo", "vastbase", "opengauss":
 		s := strings.TrimSpace(schema)
 		if s == "" {