chore(linea-ens-app): add more logs when calling Web3Signer

[alainncls]

Note

Enables mTLS between PoH Signer API and Web3Signer, adds a global HTTP exception filter, improves signing logs, and updates Web3Signer config/paths to key-files with TLS assets.

• Backend (poh-signer-api):
  • Security/mTLS: Always use HTTPS agent for Web3Signer; build agent from client pfx and trusted CA from truststore with rejectUnauthorized/requestCert; stricter config validation (requires keystore/truststore fields); richer debug/timing logs and detailed error logs; remove dev-mode skips.
  • Error Handling: Add global HttpExceptionFilter and register in main.ts; simplify poh.controller to validate address and delegate to services (no local try/catch); standardized JSON error responses.
  • Env: Populate WEB3SIGNER_* keystore/truststore vars in .env.example.
• Web3Signer service:
  • TLS: Pin image consensys/web3signer:25.2; enable TLS flags (--tls-keystore-file, --tls-keystore-password-file, --tls-known-clients-file); mount tls-files/; update config key-store-path to /key-files/.
  • Assets: Add tls-files/known-clients.txt and tls-files/web3signer-keystore-password.txt.
  • Paths: Rename keyFiles → key-files in config, volumes, and .gitignore.
• Docs:
  • Update READMEs to use key-files/ paths and fix minor formatting.

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