feat(glyph): remove opencode-env secret

Authentication is now handled by opencode-claude-auth plugin using
existing Claude Code credentials, so no separate API key env file
is needed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: stackptr

hosts/glyph/home.nix

@@ -1,5 +1,4 @@
 {
-  config,
   llm-profile,
   pkgs,
   pkgs-stable-25-11,
@@ -27,13 +26,6 @@
     };
   };
 
-  systemd.user.services.opencode-web.Service.EnvironmentFile =
-    config.age.secrets.opencode-env.path;
-
-  age.secrets.opencode-env = {
-    file = ../../home/secrets/opencode-env.age;
-  };
-
   programs.beets = {
     enable = true;
     package = pkgs-stable-25-11.beets;