refactor(core): align with cordis spatiotemporal composability architecture

- Purify core micro-kernel by removing context hardcoded helpers and reverse dependencies
- Eliminate init() side effects in infra plugins with reversible lifecycle disposal
- Completely isolate plugins by removing cross-plugin imports and using core/contracts
- Introduce TaskService and RiskControlService contracts for unified cross-plugin APIs
- Regenerate Swagger documentation and update developer guide matrix
- Achieve 0 violations in check_cordis_architecture.sh and 100% test pass

backend/plugins/domain/risk_control/logstore/db_helper.go

@@ -0,0 +1,80 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package logstore
+
+import (
+	"context"
+	"sync"
+
+	"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
+	"gorm.io/gorm"
+
+	"Wavelet/core"
+	"Wavelet/core/contracts"
+)
+
+var (
+	dbMu   sync.RWMutex
+	dbSvc  contracts.DBService
+	chConn driver.Conn
+	chDB   *gorm.DB
+)
+
+// SetDBService configures the DBService instance for logstore.
+func SetDBService(s contracts.DBService) {
+	dbMu.Lock()
+	defer dbMu.Unlock()
+	dbSvc = s
+}
+
+// SetChConnForTest configures ClickHouse native connection for test or runtime.
+func SetChConnForTest(conn driver.Conn) {
+	dbMu.Lock()
+	defer dbMu.Unlock()
+	chConn = conn
+}
+
+// SetChDBForTest configures ClickHouse GORM DB for test or runtime.
+func SetChDBForTest(db *gorm.DB) {
+	dbMu.Lock()
+	defer dbMu.Unlock()
+	chDB = db
+}
+
+func getDB(ctx context.Context) *gorm.DB {
+	if c, ok := ctx.(*core.Context); ok && c != nil {
+		if s, err := core.Inject[contracts.DBService](c); err == nil && s != nil {
+			return s.DB(ctx)
+		}
+	}
+	dbMu.RLock()
+	s := dbSvc
+	dbMu.RUnlock()
+	if s != nil {
+		return s.DB(ctx)
+	}
+	return nil
+}
+
+func getChDB(ctx context.Context) *gorm.DB {
+	dbMu.RLock()
+	customCh := chDB
+	s := dbSvc
+	dbMu.RUnlock()
+	if customCh != nil {
+		return customCh.WithContext(ctx)
+	}
+	if s != nil {
+		if ch := s.Named("clickhouse"); ch != nil {
+			return ch.WithContext(ctx)
+		}
+	}
+	return nil
+}
+
+func getChConn() driver.Conn {
+	dbMu.RLock()
+	defer dbMu.RUnlock()
+	return chConn
+}