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/hr.go

@@ -0,0 +1,92 @@
+package service
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"boc/repository"
+)
+
+// HRService handles business logic for HR operations
+type HRService struct {
+	repo *repository.HRRepository
+	db   *sql.DB
+}
+
+func NewHRService(db *sql.DB) *HRService {
+	return &HRService{
+		repo: repository.NewHRRepository(db),
+		db:   db,
+	}
+}
+
+// ListEmployees returns all employees
+func (s *HRService) ListEmployees(ctx context.Context) ([]repository.Employee, error) {
+	return s.repo.ListEmployees(ctx)
+}
+
+// GetEmployee returns a single employee by ID
+func (s *HRService) GetEmployee(ctx context.Context, id string) (*repository.Employee, error) {
+	return s.repo.GetEmployee(ctx, id)
+}
+
+// CreateEmployee creates a new employee with validation
+func (s *HRService) CreateEmployee(ctx context.Context, e *repository.Employee) error {
+	if e.Name == "" {
+		return fmt.Errorf("employee name is required")
+	}
+	if e.Email == "" {
+		return fmt.Errorf("employee email is required")
+	}
+	if e.Status == "" {
+		e.Status = "active"
+	}
+	return s.repo.CreateEmployee(ctx, e)
+}
+
+// UpdateEmployee updates an existing employee
+func (s *HRService) UpdateEmployee(ctx context.Context, id string, e *repository.Employee) error {
+	if e.Name == "" {
+		return fmt.Errorf("employee name is required")
+	}
+	return s.repo.UpdateEmployee(ctx, id, e)
+}
+
+// ListLeaves returns all leave requests
+func (s *HRService) ListLeaves(ctx context.Context) ([]repository.Leave, error) {
+	return s.repo.ListLeaves(ctx)
+}
+
+// CreateLeave creates a new leave request with validation
+func (s *HRService) CreateLeave(ctx context.Context, l *repository.Leave) error {
+	if l.EmployeeID == "" {
+		return fmt.Errorf("employee ID is required")
+	}
+	if l.Type == "" {
+		return fmt.Errorf("leave type is required")
+	}
+	if l.Status == "" {
+		l.Status = "pending"
+	}
+	return s.repo.CreateLeave(ctx, l)
+}
+
+// ListTimesheets returns all timesheet entries
+func (s *HRService) ListTimesheets(ctx context.Context) ([]repository.Timesheet, error) {
+	return s.repo.ListTimesheets(ctx)
+}
+
+// CreateTimesheet creates a new timesheet entry with validation
+func (s *HRService) CreateTimesheet(ctx context.Context, t *repository.Timesheet) error {
+	if t.EmployeeID == "" {
+		return fmt.Errorf("employee ID is required")
+	}
+	if t.Hours <= 0 {
+		return fmt.Errorf("hours must be positive")
+	}
+	if t.Status == "" {
+		t.Status = "pending"
+	}
+	return s.repo.CreateTimesheet(ctx, t)
+}