Initial commit: OmniAI backend server

.env.example

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+PG_HOST=localhost
+PG_PORT=5432
+PG_DATABASE=omniai
+PG_USER=omniai
+PG_PASSWORD=change-me-before-first-start
+
+# Server
+PORT=3600
+HOST=0.0.0.0
+
+# JWT Secret (change this!)
+JWT_SECRET=change-me-to-a-random-string-at-least-32-chars
+
+# Default admin password used only for first-time bootstrap
+DEFAULT_ADMIN_PASSWORD=change-me-before-first-start
+
+# Token expiry
+JWT_EXPIRES_IN=7d
+
+# Connection pool
+PG_POOL_MAX=10
+
+# CORS (comma separated allowed origins, * for all)
+CORS_ORIGINS=*
+
+# Phone verification. Use SMS_PROVIDER=mock for local development.
+# SMS_PROVIDER=http sends POST { phone, code, purpose } to SMS_HTTP_ENDPOINT.
+SMS_PROVIDER=mock
+SMS_HTTP_ENDPOINT=
+SMS_HTTP_TOKEN=
+SMS_CODE_SECRET=change-me-to-a-random-string-at-least-32-chars
+SMS_CODE_TTL_MINUTES=10
+SMS_CODE_COOLDOWN_SECONDS=60
+SMS_DEV_RETURN_CODE=0
+
+# WeChat Open Platform login
+WECHAT_LOGIN_APP_ID=
+WECHAT_LOGIN_APP_SECRET=
+# Recommended callback: https://your-key-server.example.com/api/auth/wechat/callback
+WECHAT_LOGIN_REDIRECT_URI=
+
+# Alibaba Cloud STS — for issuing temporary OSS credentials to clients
+# The RAM user (STS_ACCESS_KEY_ID) needs AliyunSTSAssumeRoleAccess permission
+# The RAM role (OSS_ROLE_ARN) needs OSS read/write permission on the target bucket
+STS_ACCESS_KEY_ID=
+STS_ACCESS_KEY_SECRET=
+OSS_ROLE_ARN=acs:ram::YOUR_ACCOUNT_ID:role/OmniAI-OSS-Upload
+OSS_BUCKET=your-bucket-name
+OSS_REGION=oss-cn-hangzhou