feat: separate data classification architecture

- Create separate scanner interfaces for storage, system, and docker data
- Add dedicated endpoints for metrics and docker images instead of misclassifying as updates
- Implement proper database tables for storage metrics and docker images
- Fix storage/system metrics appearing incorrectly as package updates
- Add scanner types with proper data structures for each subsystem
- Update agent handlers to use correct endpoints for each data type

aggregator-server/internal/models/docker.go

@@ -2,6 +2,7 @@ package models
 
 import (
 	"time"
+	"github.com/google/uuid"
 )
 
 // DockerPort represents a port mapping in a Docker container
@@ -81,4 +82,56 @@ type BulkDockerUpdateRequest struct {
 		ImageID     string `json:"image_id" binding:"required"`
 	} `json:"updates" binding:"required"`
 	ScheduledAt *time.Time `json:"scheduled_at,omitempty"`
+}
+
+// DockerReportRequest is sent by agents when reporting Docker image updates
+type DockerReportRequest struct {
+	CommandID string        `json:"command_id"`
+	Timestamp time.Time     `json:"timestamp"`
+	Images    []DockerImage  `json:"images"`
+}
+
+// DockerImageUpdate represents a Docker image update from agent scans
+type DockerImageUpdate struct {
+	PackageType      string            `json:"package_type"`      // "docker_image"
+	PackageName      string            `json:"package_name"`      // image name:tag
+	CurrentVersion   string            `json:"current_version"`   // current image ID
+	AvailableVersion string            `json:"available_version"` // latest image ID
+	Severity         string            `json:"severity"`          // "low", "moderate", "high", "critical"
+	RepositorySource string            `json:"repository_source"` // registry URL
+	Metadata         map[string]string `json:"metadata"`
+}
+
+// StoredDockerImage represents a Docker image update in the database
+type StoredDockerImage struct {
+	ID               uuid.UUID         `json:"id" db:"id"`
+	AgentID          uuid.UUID         `json:"agent_id" db:"agent_id"`
+	PackageType      string            `json:"package_type" db:"package_type"`
+	PackageName      string            `json:"package_name" db:"package_name"`
+	CurrentVersion   string            `json:"current_version" db:"current_version"`
+	AvailableVersion string            `json:"available_version" db:"available_version"`
+	Severity         string            `json:"severity" db:"severity"`
+	RepositorySource string            `json:"repository_source" db:"repository_source"`
+	Metadata         JSONB             `json:"metadata" db:"metadata"`
+	EventType        string            `json:"event_type" db:"event_type"`
+	CreatedAt        time.Time         `json:"created_at" db:"created_at"`
+}
+
+// DockerFilter represents filtering options for Docker image queries
+type DockerFilter struct {
+	AgentID       *uuid.UUID `json:"agent_id,omitempty"`
+	ImageName     *string    `json:"image_name,omitempty"`
+	Registry      *string    `json:"registry,omitempty"`
+	Severity      *string    `json:"severity,omitempty"`
+	HasUpdates    *bool      `json:"has_updates,omitempty"`
+	Limit         *int       `json:"limit,omitempty"`
+	Offset        *int       `json:"offset,omitempty"`
+}
+
+// DockerResult represents the result of a Docker image query
+type DockerResult struct {
+	Images  []StoredDockerImage `json:"images"`
+	Total   int                 `json:"total"`
+	Page    int                 `json:"page"`
+	PerPage int                 `json:"per_page"`
 }