fix: ConfigService now reads subsystems from database

Critical regression fix - subsystems were hardcoded instead of reading user settings.
Added CreateDefaultSubsystems to queries/subsystems.go.
ConfigService now queries agent_subsystems table for actual user configuration.
AgentLifecycleService creates default subsystems when creating new agents.
Respects user-configured enabled/auto_run settings from UI.

aggregator-server/internal/services/agent_lifecycle.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/Fimeg/RedFlag/aggregator-server/internal/config"
+	"github.com/Fimeg/RedFlag/aggregator-server/internal/database/queries"
 	"github.com/Fimeg/RedFlag/aggregator-server/internal/models"
 	"github.com/google/uuid"
 	"github.com/jmoiron/sqlx"
@@ -35,12 +36,13 @@ type AgentConfig struct {
 
 // AgentLifecycleService manages all agent lifecycle operations
 type AgentLifecycleService struct {
-	db              *sqlx.DB
-	config          *config.Config
-	buildService    *BuildService
-	configService   *ConfigService
-	artifactService *ArtifactService
-	logger          *log.Logger
+	db               *sqlx.DB
+	config           *config.Config
+	buildService     *BuildService
+	configService    *ConfigService
+	artifactService  *ArtifactService
+	subsystemQueries *queries.SubsystemQueries
+	logger           *log.Logger
 }
 
 // NewAgentLifecycleService creates a new lifecycle service
@@ -50,12 +52,13 @@ func NewAgentLifecycleService(
 	logger *log.Logger,
 ) *AgentLifecycleService {
 	return &AgentLifecycleService{
-		db:              db,
-		config:          cfg,
-		buildService:    NewBuildService(db, cfg, logger),
-		configService:   NewConfigService(db, cfg, logger),
-		artifactService: NewArtifactService(db, cfg, logger),
-		logger:          logger,
+		db:               db,
+		config:           cfg,
+		buildService:     NewBuildService(db, cfg, logger),
+		configService:    NewConfigService(db, cfg, logger),
+		artifactService:  NewArtifactService(db, cfg, logger),
+		subsystemQueries: queries.NewSubsystemQueries(db),
+		logger:           logger,
 	}
 }
 
@@ -190,7 +193,17 @@ func (s *AgentLifecycleService) createAgent(
 		VALUES (:id, :hostname, :os_type, :agent_version, :machine_id, :created_at, :updated_at)
 	`
 	_, err := s.db.NamedExecContext(ctx, query, agent)
-	return err
+	if err != nil {
+		return fmt.Errorf("agent record creation failed: %w", err)
+	}
+
+	// Create default subsystems for new agent
+	if err := s.subsystemQueries.CreateDefaultSubsystems(agent.ID); err != nil {
+		s.logger.Printf("Warning: failed to create default subsystems: %v", err)
+		// Non-fatal error - agent still created
+	}
+
+	return nil
 }
 
 // updateAgent updates existing agent record