feat(relay): Phase1 foundation — P3 Postgres store + async capability verifier + compose

RELAY-PHASE1 Wave A (2/3) + E1 infra:
- A1: createPgStores() Postgres adapter for all 9 P3 store ports + runMigrations();
  writable-CTE atomic INV8 status swaps; 0002_routes.sql. 23/23 pg tests, 96.72% cov.
- A3: real capability verifier delegating to relay-auth verifyCapabilityToken; sync->async
  seam across authz/provision/main. Full CP suite 15 files/101 pass, tsc clean.
- E1: deploy/docker-compose.yml (Postgres16+Redis7, loopback-only) + .env.example.
- docs: PLAN_RELAY_PHASE1.md file-level execution spec; PROGRESS_LOG RELAY-PHASE1 section.

.gitignore

@@ -18,3 +18,6 @@ npm-debug.log*
 # test coverage
 coverage/
 .gstack/
+
+# deploy secrets (RELAY-PHASE1) — .env.example is committed, .env is not
+deploy/.env