server: Go 服务器（REST+WSS 网关+JWT+Argon2+配对+素材直链+任务状态机）；修复并发下线 send-on-closed-channel、下发查询 SQL 优先级、配对码原子占用、上传体积上限、JWT 默认密钥告警

server/.env.example

@@ -0,0 +1,8 @@
+SERVER_ADDR=:8090
+MYSQL_DSN=root:everypublish@tcp(127.0.0.1:3306)/everypublish?charset=utf8mb4&parseTime=True&loc=Local
+REDIS_ADDR=127.0.0.1:6379
+REDIS_PASSWORD=
+JWT_SECRET=please-change-me-in-production
+BASE_URL=http://127.0.0.1:8090
+STORAGE_DIR=./data/materials
+STATIC_DIR=../apps/web/dist