Feat/remove gateway deps

[cardosofede]

remove gateway crate wallet, show private key, send

[rapcmia]

• Build local image and setup using docker make setup; make deploy
• Setup this PR with gateway latest image 2.15.1 docker using /gateway/start
• POST /gateway/wallets/create → 404 Not Found
• POST /gateway/wallets/show-private-key → 404 Not Found
• POST /gateway/wallets/send → 404 Not Found
• All three routes are no longer available in swagger docs
• Test all remaining /accounts/gateway/ routes
  • POST /accounts/gateway/add-wallet returned 201 and added the Solana wallet
  • GET /accounts/gateway/wallets showed the wallet and default address
  • POST /accounts/gateway/wallet/set-default returned 200
  • POST /portfolio/state with skip_gateway:
    • true exludes gateway wallet balances ok
    • false displayed gateway wallet balance ok
  • DELETE /accounts/gateway/solana/ returned 200
  • After delete successful and wait for couple of sets before another GET /accounts/gateway/wallets, it showed the wallet list is cleared
• Test non-wallet gateway routes:
  • GET /gateway/status returned, Gateway running: true
  • GET /gateway/connectors returned 200 with connector data