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/setup-db-commands.txt

@@ -0,0 +1,19 @@
+# Run these commands to set up the database:
+
+# Option 1: If you have sudo access
+sudo -u postgres psql << EOSQL
+CREATE DATABASE sankofa;
+ALTER USER postgres PASSWORD 'dev_sankofa_2024_secure';
+\q
+EOSQL
+
+# Option 2: If you can connect as postgres user directly
+psql -U postgres << EOSQL
+CREATE DATABASE sankofa;
+ALTER USER postgres PASSWORD 'dev_sankofa_2024_secure';
+\q
+EOSQL
+
+# Option 3: Using createdb command
+createdb -U postgres sankofa
+psql -U postgres -c "ALTER USER postgres PASSWORD 'dev_sankofa_2024_secure';"