fix: Correct SQLite result array handling

- Fix table existence check to properly handle SQLite result arrays
- Add array type guard for table listing query
- Improve error message clarity for invalid table names

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

packages/drivers/sql/src/index.ts

@@ -645,7 +645,7 @@ export class SqlDriver implements Driver {
                     [tableName]
                 );
 
-                if (!tableExistsResult || tableExistsResult.length === 0) {
+                if (!Array.isArray(tableExistsResult) || tableExistsResult.length === 0) {
                     // If the table does not exist, there are no foreign keys to introspect.
                     return foreignKeys;
                 }
@@ -708,10 +708,10 @@ export class SqlDriver implements Driver {
 
                 // Validate that the sanitized table name exists in the database before using it in PRAGMA
                 const tablesResult = await this.knex.raw("SELECT name FROM sqlite_master WHERE type = 'table'");
-                const tableNames = tablesResult.map((row: any) => row.name);
+                const tableNames = Array.isArray(tablesResult) ? tablesResult.map((row: any) => row.name) : [];
 
                 if (!tableNames.includes(safeTableName)) {
-                    console.warn('Could not introspect primary keys for SQLite table: table does not exist after sanitization.');
+                    console.warn('Could not introspect primary keys: table name contains invalid characters or table does not exist.');
                     return primaryKeys;
                 }