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

.gitignore

@@ -2,6 +2,9 @@
 node_modules/
 vendor/
 
+# Optional local Mermaid (see frontend/public/thirdparty/README.md)
+frontend/public/thirdparty/mermaid.min.js
+
 # Build outputs
 dist/
 build/