feat: explorer API, wallet, CCIP scripts, and config refresh

- Backend REST/gateway/track routes, analytics, Blockscout proxy paths.
- Frontend wallet and liquidity surfaces; MetaMask token list alignment.
- Deployment docs, verification scripts, address inventory updates.

Check: go build ./... under backend/ (pass).
Made-with: Cursor

backend/api/rest/addresses_internal_test.go

@@ -0,0 +1,19 @@
+package rest
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestHandleGetAddressRequiresDB(t *testing.T) {
+	server := NewServer(nil, 138)
+	req := httptest.NewRequest(http.MethodGet, "/api/v1/addresses/138/0xAbCdEf1234567890ABCdef1234567890abCDef12?address=0xAbCdEf1234567890ABCdef1234567890abCDef12", nil)
+	w := httptest.NewRecorder()
+
+	server.handleGetAddress(w, req)
+
+	if w.Code != http.StatusServiceUnavailable {
+		t.Fatalf("expected 503 when db is unavailable, got %d", w.Code)
+	}
+}