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/service/sales.go

@@ -0,0 +1,78 @@
+package service
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"boc/repository"
+)
+
+// SalesService handles business logic for sales operations
+type SalesService struct {
+	repo *repository.SalesRepository
+	db   *sql.DB
+}
+
+func NewSalesService(db *sql.DB) *SalesService {
+	return &SalesService{
+		repo: repository.NewSalesRepository(db),
+		db:   db,
+	}
+}
+
+// ListDeals returns all deals filtered by status
+func (s *SalesService) ListDeals(ctx context.Context, status string) ([]repository.Deal, error) {
+	return s.repo.ListDeals(ctx, status)
+}
+
+// GetDeal returns a single deal by ID
+func (s *SalesService) GetDeal(ctx context.Context, id string) (*repository.Deal, error) {
+	return s.repo.GetDeal(ctx, id)
+}
+
+// CreateDeal creates a new deal with validation
+func (s *SalesService) CreateDeal(ctx context.Context, d *repository.Deal) error {
+	if d.Name == "" {
+		return fmt.Errorf("deal name is required")
+	}
+	if d.CustomerID == "" {
+		return fmt.Errorf("customer ID is required")
+	}
+	if d.Value <= 0 {
+		return fmt.Errorf("deal value must be positive")
+	}
+	if d.Status == "" {
+		d.Status = "open"
+	}
+	if d.Stage == "" {
+		d.Stage = "discovery"
+	}
+	if d.Currency == "" {
+		d.Currency = "USD"
+	}
+	return s.repo.CreateDeal(ctx, d)
+}
+
+// UpdateDeal updates an existing deal
+func (s *SalesService) UpdateDeal(ctx context.Context, id string, d *repository.Deal) error {
+	if d.Name == "" {
+		return fmt.Errorf("deal name is required")
+	}
+	return s.repo.UpdateDeal(ctx, id, d)
+}
+
+// ListProducts returns all active products
+func (s *SalesService) ListProducts(ctx context.Context) ([]repository.Product, error) {
+	return s.repo.ListProducts(ctx)
+}
+
+// GetMRR calculates monthly recurring revenue
+func (s *SalesService) GetMRR(ctx context.Context) (float64, error) {
+	return s.repo.GetMRR(ctx)
+}
+
+// GetARR calculates annual recurring revenue
+func (s *SalesService) GetARR(ctx context.Context) (float64, error) {
+	return s.repo.GetARR(ctx)
+}