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/blocks.go

@@ -10,6 +10,10 @@ import (
 
 // handleGetBlockByNumber handles GET /api/v1/blocks/{chain_id}/{number}
 func (s *Server) handleGetBlockByNumber(w http.ResponseWriter, r *http.Request, blockNumber int64) {
+	if !s.requireDB(w) {
+		return
+	}
+
 	// Validate input (already validated in routes.go, but double-check)
 	if blockNumber < 0 {
 		writeValidationError(w, ErrInvalidBlockNumber)
@@ -72,6 +76,12 @@ func (s *Server) handleGetBlockByNumber(w http.ResponseWriter, r *http.Request,
 
 // handleGetBlockByHash handles GET /api/v1/blocks/{chain_id}/hash/{hash}
 func (s *Server) handleGetBlockByHash(w http.ResponseWriter, r *http.Request, hash string) {
+	if !s.requireDB(w) {
+		return
+	}
+
+	hash = normalizeHash(hash)
+
 	// Validate hash format (already validated in routes.go, but double-check)
 	if !isValidHash(hash) {
 		writeValidationError(w, ErrInvalidHash)