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/etherscan_internal_test.go

@@ -0,0 +1,24 @@
+package rest
+
+import "testing"
+
+func TestDecimalStringToHex(t *testing.T) {
+	got := decimalStringToHex("1000000000000000000")
+	if got != "0xde0b6b3a7640000" {
+		t.Fatalf("decimalStringToHex() = %s", got)
+	}
+}
+
+func TestNormalizeHexInput(t *testing.T) {
+	tests := map[string]string{
+		"":         "0x",
+		"deadbeef": "0xdeadbeef",
+		"0x1234":   "0x1234",
+	}
+
+	for input, want := range tests {
+		if got := normalizeHexInput(input); got != want {
+			t.Fatalf("normalizeHexInput(%q) = %q, want %q", input, got, want)
+		}
+	}
+}