Use shared Renovate preset and update pnpm to v10

[bdrhn9]

Migrate the repository from pnpm v9 to v10 and adopt the shared Renovate preset from api3dao/renovate-config. This improves supply chain security via minimumReleaseAge enforcement and standardizes Renovate configuration across projects.

As a part of https://github.com/api3dao/tasks/issues/1855

Changes beyond the task description

• injectWorkspacePackages: true: Required for pnpm v10 — without this, pnpm deploy (used in Dockerfile) fails.
  The alternative is the --legacy flag but that may be removed in future versions
• Dependency downgrades: axios ^1.13.5 → ^1.13.4, @aws-sdk/client-s3 ^3.985.0 → ^3.984.0 — latest
  versions were too new for the 14-day minimumReleaseAge
• eslint added as direct devDependency: Was only a transitive peer dep of @api3/eslint-plugin-commons. pnpm
  v10's stricter hoisting caused eslint: not found in CI
• Lint fixes: index < 0 → index === -1 in in-memory-cache.ts (new eslint-plugin-unicorn@56 rule after
  lockfile regeneration); || → ?? in server.ts (@typescript-eslint/prefer-nullish-coalescing)
• Dockerfile: Fixed FROM ... as → FROM ... AS casing warnings

Test plan

• Run the e2e tests locally
• CI pipeline passes

[hiletmis]

LGTM

[hiletmis]

It seems that node, actions/node-versions and @types/node excluded. So that they can be tracked on demand

[bdrhn9]

They will be bumped on every 6 months as defined here which looks tolerable.