Use zstd rather than brotli for static file compression.

pyproject.toml

@@ -27,7 +27,6 @@ dependencies = [
     "argon2-cffi>=25.1.0",
     "av>=15.0.0",
     "blake3>=1.0.5",
-    "brotli>=1.1.0",
     "docopt>=0.6.2",
     "inotify>=0.2.12",
     "msgspec>=0.19.0",
@@ -42,6 +41,7 @@ dependencies = [
     "setproctitle>=1.3.6",
     "stream-zip>=0.0.83",
     "tomli_w>=1.2.0",
+    "zstandard>=0.24.0",
 ]
 
 [project.urls]