fix: upgrade vulnerable fastify dependency

[samsamtrum]

Summary

• Upgrade fastify from ^4.25.2 to ^5.7.2 to address GHSA-jx2c-rxcm-jvmq / CVE-2026-25223.
• Update the lockfile so the workspace resolves Fastify 5.x.
• Adjust two small Fastify 5 typing/API compatibility points:
  • initialize the request rpcMethod decorator with a string value instead of null
  • normalize request.routeOptions.url before using it in route metrics labels

Closes #684.

Verification

• corepack pnpm install --ignore-scripts --lockfile-only --filter ./src
• corepack pnpm install --ignore-scripts --frozen-lockfile --filter ./src...
• corepack pnpm --filter alto run build

Build gets past the Fastify 5 type changes and stops because the generated contract JSON artifacts are not present in this checkout:

TS2307: Cannot find module '../contracts/EntryPointSimulations.sol/EntryPointSimulations07.json'
TS2307: Cannot find module '../contracts/EntryPointSimulations.sol/EntryPointSimulations08.json'
TS2307: Cannot find module '../contracts/EntryPointSimulations.sol/EntryPointSimulations09.json'
TS2307: Cannot find module '../contracts/PimlicoSimulations.sol/PimlicoSimulations.json'
TS2307: Cannot find module '../../contracts/EntryPointGasEstimationOverride.sol/EntryPointGasEstimationOverride06.json'
TS2307: Cannot find module '../contracts/EntryPointFilterOpsOverride.sol/EntryPointFilterOpsOverride06.json'
TS2307: Cannot find module '../contracts/EntryPointFilterOpsOverride.sol/EntryPointFilterOpsOverride07.json'
TS2307: Cannot find module '../contracts/EntryPointFilterOpsOverride.sol/EntryPointFilterOpsOverride08.json'
TS2307: Cannot find module '../contracts/EntryPointFilterOpsOverride.sol/EntryPointFilterOpsOverride09.json'

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud