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/.env.example

@@ -0,0 +1,25 @@
+# Database Configuration
+DB_HOST=localhost
+DB_PORT=5432
+DB_NAME=sankofa
+DB_USER=postgres
+# For development: minimum 8 characters
+# For production: minimum 32 characters with uppercase, lowercase, numbers, and special characters
+DB_PASSWORD=your_secure_password_here
+
+# Application Configuration
+NODE_ENV=development
+PORT=4000
+
+# Keycloak Configuration (for Identity Service)
+KEYCLOAK_URL=http://localhost:8080
+KEYCLOAK_REALM=master
+KEYCLOAK_CLIENT_ID=sankofa-api
+KEYCLOAK_CLIENT_SECRET=your_keycloak_client_secret
+
+# JWT Configuration
+# For production: minimum 64 characters
+JWT_SECRET=your_jwt_secret_here_minimum_64_chars_for_production
+
+# Logging
+LOG_LEVEL=info