ci(codeql): switch to advanced setup, exclude Fastify false positive (#68)
The js/missing-rate-limiting rule does not recognise @fastify/rate-limit's
per-route config.rateLimit pattern and flags every route handler as
unprotected. All flagged routes already have rate limiting configured.
Switch from CodeQL default setup to an advanced workflow with a custom
config that excludes this rule while keeping the security-extended suite.
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