The 662-line handler (the largest in the file) split into one function
per data-source/merge stage: facility+IX-location coordinate resolution
(facilities.js), neighbour name-resolution + threat-intel enrichment
(enrich-neighbours.js), RIR/country derivation cascade (rir-country.js),
visibility/prefix-size computation (routing-info.js), multi-source
cross-checks + data-quality scoring (cross-check.js), and a slim
orchestrator (index.js) running Phase 0/1 fetch and final result assembly.
Verified via node --check, eslint no-undef (2 known bugs remain: compare,
webhooks), and smoke-test harness (28/28 match, including a byte-for-byte
match on /api/lookup's own large response body -- the strongest possible
confirmation this, the most complex handler in the file, was decomposed
without changing behavior).
server.js: 2917 -> 1734 lines (6838 originally -- 75% reduction so far).
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