Fix test for empty registry case

The test case "empty registry returns success" was falling into the
default case which expected at least one server. Added specific handling
for the empty registry case to properly assert an empty server list.

Fixes #426

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

:house: Remote-Dev: homespace

Author: domdomegg

internal/api/handlers/v0/servers_test.go

@@ -330,6 +330,8 @@ func TestServersListEndpoint(t *testing.T) {
 				case "combined search and updated_since filter":
 					assert.Len(t, resp.Servers, 1, "Expected one server matching both filters")
 					assert.Contains(t, resp.Servers[0].Name, "combined", "Server name should contain search term")
+				case "empty registry returns success":
+					assert.Empty(t, resp.Servers, "Expected empty server list for empty registry")
 				case "comprehensive query with all parameters":
 					// Should return only latest versions of servers matching "filesystem" search term
 					// Expected: 2 servers (filesystem-server v2.0.0 and filesystem-tools v3.0.0)