API: Phoenix railing proxy, API key auth for /api/v1/*, schema export, docs, migrations, tests

- Phoenix API Railing: proxy to PHOENIX_RAILING_URL, tenant me routes
- Tenant-auth: X-API-Key support for /api/v1/* (api_keys table)
- Migration 026: api_keys table; 025 sovereign stack marketplace
- GET /graphql/schema, GET /graphql-playground, api/docs OpenAPI
- Integration tests: phoenix-railing.test.ts
- docs/api/API_VERSIONING: /api/v1/ railing alignment
- docs/phoenix/PORTAL_RAILING_WIRING

Made-with: Cursor

api/package.json

@@ -16,7 +16,10 @@
     "db:migrate:up": "tsx src/db/migrate.ts up",
     "db:migrate:down": "tsx src/db/migrate.ts down",
     "db:migrate:status": "tsx src/db/migrate.ts status",
-    "db:seed": "tsx src/db/seed.ts"
+    "db:seed": "tsx src/db/seed.ts",
+    "db:seed:sovereign-stack": "tsx src/db/seeds/sovereign_stack_services.ts",
+    "verify:sovereign-stack": "tsx scripts/verify-sovereign-stack.ts",
+    "create-env": "bash scripts/create-env.sh"
   },
   "dependencies": {
     "@apollo/server": "^4.9.5",