feat: integrate Grafana dashboards into BOC DashboardPage

- Add Infrastructure Health section with CPU/Memory/Disk panels
- Add Service Status section with PM2/Docker panels
- Create GrafanaPanel component for iframe embedding
- Build passes successfully

backend/ledger/real_client.go

@@ -140,3 +140,47 @@ func accountsToMaps(accounts []Account) []map[string]interface{} {
 	}
 	return result
 }
+
+// Transaction represents a ledger transaction
+type Transaction struct {
+	ID          string  `json:"id"`
+	Date        string  `json:"date"`
+	Description string  `json:"description"`
+	Amount      float64 `json:"amount"`
+	Type        string  `json:"type"`
+	AccountCode string  `json:"account_code,omitempty"`
+	AccountName string  `json:"account_name,omitempty"`
+}
+
+// GetTransactions returns all journal entries as transactions
+func (c *RealClient) GetTransactions(ctx context.Context) ([]Transaction, error) {
+	rows, err := c.db.QueryContext(ctx, `
+		SELECT je.id, je.entry_date, je.description, 
+		       COALESCE(jl.debit, 0) - COALESCE(jl.credit, 0) as amount,
+		       CASE 
+				   WHEN COALESCE(jl.debit, 0) > 0 THEN 'debit'
+				   ELSE 'credit'
+			   END as type,
+			   a.code, a.name
+		FROM journal_entries je
+		JOIN journal_lines jl ON je.id = jl.journal_entry_id
+		JOIN accounts a ON jl.account_id = a.id
+		ORDER BY je.entry_date DESC
+		LIMIT 100
+	`)
+	if err != nil {
+		return nil, fmt.Errorf("query transactions: %w", err)
+	}
+	defer rows.Close()
+	
+	var transactions []Transaction
+	for rows.Next() {
+		var t Transaction
+		if err := rows.Scan(&t.ID, &t.Date, &t.Description, &t.Amount, &t.Type, &t.AccountCode, &t.AccountName); err != nil {
+			return nil, fmt.Errorf("scan transaction: %w", err)
+		}
+		transactions = append(transactions, t)
+	}
+	
+	return transactions, rows.Err()
+}