feat: SolaceNet gateway rails, IRU marketplace hardening, and docs

- Gateway adapter registry, rails routes, optional SOLACENET_GATEWAY_RAILS_ENFORCE; HTTP integration tests.
- IRU marketplace: rate limits, public routes, notifications/SMTP env docs; marketplace UI constants and flows.
- Quantum proxy legacy protocol types; debank/tezos/GSDS touch-ups; .env.example operator notes.
- SolaceNet doc set (gaps, runbooks, telecom schema example).

Tests: npm run test:iru-marketplace, npm run test:gateway (pass).
Note: full-repo tsc still reports unrelated legacy errors outside this change set.
Made-with: Cursor

scripts/sql/fix-iru-inquiry-offering-fk.sql

@@ -0,0 +1,19 @@
+-- Repair IruInquiry.offeringId when it incorrectly stores IruOffering.offeringId (business code)
+-- instead of IruOffering.id (UUID). FK: IruInquiry.offeringId -> IruOffering.id
+--
+-- Review affected rows first:
+--   SELECT i."inquiryId", i."offeringId" AS broken_fk, o.id AS correct_uuid, o."offeringId" AS business_id
+--   FROM "IruInquiry" i
+--   INNER JOIN "IruOffering" o ON o."offeringId" = i."offeringId"
+--   WHERE i."offeringId" <> o.id;
+--
+-- Apply (transaction recommended):
+--   BEGIN;
+--   \i scripts/sql/fix-iru-inquiry-offering-fk.sql
+--   COMMIT;
+
+UPDATE "IruInquiry" AS i
+SET "offeringId" = o.id
+FROM "IruOffering" AS o
+WHERE o."offeringId" = i."offeringId"
+  AND i."offeringId" IS DISTINCT FROM o.id;