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/infra/storage/objectstore/config.go

@@ -12,8 +12,6 @@ import (
 	"strings"
 	"time"
 
-	database "Wavelet/plugins/infra/database"
-
 	"gorm.io/gorm"
 )
 
@@ -110,12 +108,15 @@ func LoadConfig(ctx context.Context) (Config, error) {
 
 func loadConfigByKey(ctx context.Context, key string, fallback Config) (Config, error) {
 	var val string
-	err := database.DB(ctx).Table("w_system_configs").Where("key = ?", key).Pluck("value", &val).Error
-	if err != nil {
-		if errors.Is(err, gorm.ErrRecordNotFound) {
-			return fallback, nil
+	db := getDB(ctx)
+	if db != nil {
+		err := db.Table("w_system_configs").Where("key = ?", key).Pluck("value", &val).Error
+		if err != nil {
+			if errors.Is(err, gorm.ErrRecordNotFound) {
+				return fallback, nil
+			}
+			return Config{}, err
 		}
-		return Config{}, err
 	}
 	if strings.TrimSpace(val) == "" {
 		return fallback, nil
@@ -182,7 +183,7 @@ func SaveActiveConfig(ctx context.Context, cfg Config) error {
 }
 
 func saveSystemConfig(ctx context.Context, key string, value any, description string) error {
-	err := database.DB(ctx).Transaction(func(tx *gorm.DB) error {
+	err := getDB(ctx).Transaction(func(tx *gorm.DB) error {
 		return upsertSystemConfig(ctx, tx, key, value, description)
 	})
 	if err == nil && key == "storage_config" {