Initial project scaffold

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

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+APP_ENV=development
+HTTP_ADDR=:8088
+
+# Reuse the same PostgreSQL instance as Agent memory, but use an independent
+# database. When running from the host, use the externally reachable host/port.
+AI_GATEWAY_DATABASE_NAME=easyai_ai_gateway
+AI_GATEWAY_DATABASE_URL=postgresql://easyai:easyai2025@localhost:5432/easyai_ai_gateway?sslmode=disable
+
+# When running inside the EasyAI docker network, use the container DNS name:
+# AI_GATEWAY_DATABASE_URL=postgresql://easyai:easyai2025@easyai-pgvector:5432/easyai_ai_gateway?schema=public
+#
+# If AI_GATEWAY_DATABASE_URL is omitted, the service can derive host/user/pass
+# from MEMORY_DATABASE_URL but will still replace the database with
+# AI_GATEWAY_DATABASE_NAME.
+# MEMORY_DATABASE_URL=postgresql://easyai:easyai2025@easyai-pgvector:5432/easyai_memory?schema=public
+
+# Keep this aligned with easyai-server-main CONFIG_JWT_SECRET in the first migration phase.
+CONFIG_JWT_SECRET=this is a very secret secret
+
+# Used when the gateway delegates OpenAPI sk-* validation, file upload, and settlement callbacks.
+SERVER_MAIN_BASE_URL=http://localhost:3000
+SERVER_MAIN_INTERNAL_TOKEN=change-me
+
+CORS_ALLOWED_ORIGIN=http://localhost:5178
+VITE_GATEWAY_API_BASE_URL=http://localhost:8088