fix(zed): lower display priority in oauth list

Move zed provider to the bottom of oauth providers by setting priority to 999.

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

open-sse/providers/registry/zed.js

@@ -1,7 +1,7 @@
 // Zed provider — RSA keypair callback auth (NOT standard OAuth).
 export default {
   id: "zed",
-  priority: 10,
+  priority: 999,
   alias: "zd",
   uiAlias: "zd",
   display: {