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/handlers/finance_v2.go

@@ -0,0 +1,104 @@
+package handlers
+
+import (
+	"net/http"
+	"os"
+
+	"boc/ledger"
+)
+
+// FinanceHandlerV2 uses RobustClient for ledger integration
+type FinanceHandlerV2 struct {
+	ledgerClient *ledger.RobustClient
+}
+
+// NewFinanceHandlerV2 creates a new finance handler with ledger integration
+func NewFinanceHandlerV2() *FinanceHandlerV2 {
+	ledgerDBURL := os.Getenv("LEDGER_DB_URL")
+	if ledgerDBURL == "" {
+		ledgerDBURL = "postgres://postgres:postgres@localhost:5432/aamos_ledger?sslmode=disable"
+	}
+
+	client, err := ledger.NewRobustClient(ledgerDBURL)
+	if err != nil {
+		// Fallback: create handler without ledger
+		return &FinanceHandlerV2{}
+	}
+
+	return &FinanceHandlerV2{ledgerClient: client}
+}
+
+func (h *FinanceHandlerV2) GetBalanceSheet(w http.ResponseWriter, r *http.Request) {
+	if h.ledgerClient == nil {
+		writeError(w, http.StatusServiceUnavailable, "ledger not available")
+		return
+	}
+
+	period := r.URL.Query().Get("period")
+	bs, err := h.ledgerClient.GetBalanceSheet(r.Context(), period)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "failed to get balance sheet")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]interface{}{
+		"ok":     true,
+		"report": bs,
+	})
+}
+
+func (h *FinanceHandlerV2) GetIncomeStatement(w http.ResponseWriter, r *http.Request) {
+	if h.ledgerClient == nil {
+		writeError(w, http.StatusServiceUnavailable, "ledger not available")
+		return
+	}
+
+	period := r.URL.Query().Get("period")
+	is, err := h.ledgerClient.GetIncomeStatement(r.Context(), period)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "failed to get income statement")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]interface{}{
+		"ok":     true,
+		"report": is,
+	})
+}
+
+func (h *FinanceHandlerV2) GetMomsReport(w http.ResponseWriter, r *http.Request) {
+	if h.ledgerClient == nil {
+		writeError(w, http.StatusServiceUnavailable, "ledger not available")
+		return
+	}
+
+	period := r.URL.Query().Get("period")
+	report, err := h.ledgerClient.GetMomsReport(r.Context(), period)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "failed to get moms report")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]interface{}{
+		"ok":     true,
+		"report": report,
+	})
+}
+
+func (h *FinanceHandlerV2) GetAccounts(w http.ResponseWriter, r *http.Request) {
+	if h.ledgerClient == nil {
+		writeError(w, http.StatusServiceUnavailable, "ledger not available")
+		return
+	}
+
+	accounts, err := h.ledgerClient.GetAccounts(r.Context())
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "failed to get accounts")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]interface{}{
+		"ok":       true,
+		"accounts": accounts,
+	})
+}