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/api_test.go

@@ -214,6 +214,38 @@ func TestPagination(t *testing.T) {
 	}
 }
 
+func TestAuthNonceRequiresDB(t *testing.T) {
+	_, mux := setupTestServer(t)
+
+	req := httptest.NewRequest("POST", "/api/v1/auth/nonce", bytes.NewBufferString(`{"address":"0x4A666F96fC8764181194447A7dFdb7d471b301C8"}`))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	mux.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusServiceUnavailable, w.Code)
+
+	var response map[string]interface{}
+	err := json.Unmarshal(w.Body.Bytes(), &response)
+	require.NoError(t, err)
+	assert.NotNil(t, response["error"])
+}
+
+func TestAuthWalletRequiresDB(t *testing.T) {
+	_, mux := setupTestServer(t)
+
+	req := httptest.NewRequest("POST", "/api/v1/auth/wallet", bytes.NewBufferString(`{"address":"0x4A666F96fC8764181194447A7dFdb7d471b301C8","signature":"0xdeadbeef","nonce":"abc"}`))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	mux.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusServiceUnavailable, w.Code)
+
+	var response map[string]interface{}
+	err := json.Unmarshal(w.Body.Bytes(), &response)
+	require.NoError(t, err)
+	assert.NotNil(t, response["error"])
+}
+
 func TestAIContextEndpoint(t *testing.T) {
 	_, mux := setupTestServer(t)