🐛 fix(sqlite): 修复表概览行数与大小统计

- 通过 driver-agent 为 SQLite 表列表补充精确行数与存储占用
- 使用 dbstat 区分数据页和索引页并支持相对大小展示
- 区分未知统计与真实零值并补充前后端回归测试

internal/db/optional_driver_agent_impl.go

@@ -861,6 +861,20 @@ func (d *OptionalDriverAgentDB) GetTables(dbName string) ([]string, error) {
 	return tables, nil
 }
 
+func (d *OptionalDriverAgentDB) GetTableRowCounts(_ string, tables []string) (map[string]int64, error) {
+	if normalizeRuntimeDriverType(d.driverType) != "sqlite" {
+		return map[string]int64{}, nil
+	}
+	return getSQLiteTableRowCounts(d.Query, tables)
+}
+
+func (d *OptionalDriverAgentDB) GetTableStorageStats(_ string, tables []string) (map[string]TableStorageStats, error) {
+	if normalizeRuntimeDriverType(d.driverType) != "sqlite" {
+		return map[string]TableStorageStats{}, nil
+	}
+	return getSQLiteTableStorageStats(d.Query, tables)
+}
+
 func (d *OptionalDriverAgentDB) GetCreateStatement(dbName, tableName string) (string, error) {
 	client, err := d.requireClient()
 	if err != nil {