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/auth.go

@@ -2,6 +2,7 @@ package rest
 
 import (
 	"encoding/json"
+	"errors"
 	"net/http"
 
 	"github.com/explorer/backend/auth"
@@ -13,6 +14,9 @@ func (s *Server) handleAuthNonce(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusMethodNotAllowed, "method_not_allowed", "Method not allowed")
 		return
 	}
+	if !s.requireDB(w) {
+		return
+	}
 
 	var req auth.NonceRequest
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -23,6 +27,10 @@ func (s *Server) handleAuthNonce(w http.ResponseWriter, r *http.Request) {
 	// Generate nonce
 	nonceResp, err := s.walletAuth.GenerateNonce(r.Context(), req.Address)
 	if err != nil {
+		if errors.Is(err, auth.ErrWalletAuthStorageNotInitialized) {
+			writeError(w, http.StatusServiceUnavailable, "service_unavailable", err.Error())
+			return
+		}
 		writeError(w, http.StatusBadRequest, "bad_request", err.Error())
 		return
 	}
@@ -37,6 +45,9 @@ func (s *Server) handleAuthWallet(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusMethodNotAllowed, "method_not_allowed", "Method not allowed")
 		return
 	}
+	if !s.requireDB(w) {
+		return
+	}
 
 	var req auth.WalletAuthRequest
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -47,6 +58,10 @@ func (s *Server) handleAuthWallet(w http.ResponseWriter, r *http.Request) {
 	// Authenticate wallet
 	authResp, err := s.walletAuth.AuthenticateWallet(r.Context(), &req)
 	if err != nil {
+		if errors.Is(err, auth.ErrWalletAuthStorageNotInitialized) {
+			writeError(w, http.StatusServiceUnavailable, "service_unavailable", err.Error())
+			return
+		}
 		writeError(w, http.StatusUnauthorized, "unauthorized", err.Error())
 		return
 	}
@@ -54,4 +69,3 @@ func (s *Server) handleAuthWallet(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(authResp)
 }
-