Implement proper storage metrics (P0-009)\n\n- Add dedicated storage_metrics table\n- Create StorageMetricReport models with proper field names\n- Add ReportStorageMetrics to agent client\n- Update storage scanner to use new method\n- Implement server-side handlers and queries\n- Register new routes and update UI\n- Remove legacy Scan() method\n- Follow ETHOS principles: honest naming, clean architecture

aggregator-server/internal/models/storage_metrics.go

@@ -0,0 +1,40 @@
+package models
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// StorageMetric represents a storage metric from an agent
+type StorageMetric struct {
+	ID             uuid.UUID              `json:"id" db:"id"`
+	AgentID        uuid.UUID              `json:"agent_id" db:"agent_id"`
+	Mountpoint     string                 `json:"mountpoint" db:"mountpoint"`
+	Device         string                 `json:"device" db:"device"`
+	DiskType       string                 `json:"disk_type" db:"disk_type"`
+	Filesystem     string                 `json:"filesystem" db:"filesystem"`
+	TotalBytes     int64                  `json:"total_bytes" db:"total_bytes"`
+	UsedBytes      int64                  `json:"used_bytes" db:"used_bytes"`
+	AvailableBytes int64                  `json:"available_bytes" db:"available_bytes"`
+	UsedPercent    float64                `json:"used_percent" db:"used_percent"`
+	Severity       string                 `json:"severity" db:"severity"`
+	Metadata       map[string]interface{} `json:"metadata,omitempty" db:"metadata"`
+	CreatedAt      time.Time              `json:"created_at" db:"created_at"`
+}
+
+// StorageMetricRequest represents the request payload for storage metrics
+type StorageMetricRequest struct {
+	AgentID   uuid.UUID       `json:"agent_id"`
+	CommandID string          `json:"command_id"`
+	Timestamp time.Time       `json:"timestamp"`
+	Metrics   []StorageMetric `json:"metrics"`
+}
+
+// StorageMetricsList represents a list of storage metrics with pagination
+type StorageMetricsList struct {
+	Metrics []StorageMetric `json:"metrics"`
+	Total   int             `json:"total"`
+	Page    int             `json:"page"`
+	PerPage int             `json:"per_page"`
+}