optimize easytier-web (#522)

1. use default compress level for tower_http. the best level consume
lots of memory
2. add more help message and command line arg.

Cargo.lock

@@ -1987,12 +1987,14 @@ dependencies = [
  "password-auth",
  "rand 0.8.5",
  "rust-embed",
+ "rust-i18n",
  "rusttype",
  "sea-orm",
  "sea-orm-migration",
  "serde",
  "serde_json",
  "sqlx",
+ "sys-locale",
  "thiserror 1.0.63",
  "tokio",
  "tower-http",