perf(storage): 极简化任务历史并增加保留治理

停止持久化 provider 原始响应、兼容响应快照、attempt/event/outbox 重复 JSON，并由标准任务结果动态生成 Kling/Keling/Volces 兼容响应。

增加事件去重与预算、极简 callback 投递、7/30 天分批清理、安全删除条件、并发迁移索引及可实际恢复的任务域排除备份。历史清理默认关闭，待兼容协议和异步恢复在线验证后单独启用。

验证：Go 全量测试与 go vet、PostgreSQL 18 集成与实际备份恢复、迁移安全测试、bash -n、ShellCheck、Compose 配置和人工发布脚本测试均通过。

apps/api/cmd/migrate/main.go

@@ -13,6 +13,11 @@ import (
 	"github.com/jackc/pgx/v5"
 )
 
+const (
+	noTransactionMigrationMarker = "-- easyai:migration:no-transaction"
+	migrationStatementSeparator  = "-- easyai:migration:statement"
+)
+
 func main() {
 	cfg := config.Load()
 	logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
@@ -63,6 +68,22 @@ CREATE TABLE IF NOT EXISTS schema_migrations (
 			os.Exit(1)
 		}
 
+		noTransaction, statements := migrationStatements(string(sqlBytes))
+		if noTransaction {
+			for _, statement := range statements {
+				if _, err := conn.Exec(ctx, statement); err != nil {
+					logger.Error("execute non-transaction migration failed", "version", version, "error", err)
+					os.Exit(1)
+				}
+			}
+			if _, err := conn.Exec(ctx, "INSERT INTO schema_migrations(version) VALUES($1)", version); err != nil {
+				logger.Error("record non-transaction migration failed", "version", version, "error", err)
+				os.Exit(1)
+			}
+			logger.Info("migration applied", "version", version, "transactional", false)
+			continue
+		}
+
 		tx, err := conn.Begin(ctx)
 		if err != nil {
 			logger.Error("begin migration failed", "version", version, "error", err)
@@ -95,3 +116,19 @@ CREATE TABLE IF NOT EXISTS schema_migrations (
 
 	fmt.Println("migrations complete")
 }
+
+func migrationStatements(sql string) (bool, []string) {
+	trimmed := strings.TrimSpace(sql)
+	if !strings.HasPrefix(trimmed, noTransactionMigrationMarker) {
+		return false, []string{sql}
+	}
+	trimmed = strings.TrimSpace(strings.TrimPrefix(trimmed, noTransactionMigrationMarker))
+	parts := strings.Split(trimmed, migrationStatementSeparator)
+	statements := make([]string, 0, len(parts))
+	for _, part := range parts {
+		if statement := strings.TrimSpace(part); statement != "" {
+			statements = append(statements, statement)
+		}
+	}
+	return true, statements
+}