v0.9.2 web and wasm changes for deployment

cmd/chess-client-cli/url_wasm.go

@@ -0,0 +1,11 @@
+//go:build js && wasm
+
+package main
+
+import "syscall/js"
+
+// Derive base URL from the page's own origin at runtime
+// When served via nginx at domain.com, origin = "https://domain.com"
+// and the chess API proxy lives at /chess — so BaseURL = "https://comain.com/chess".
+// Works correctly for any deployment domain without rebuilding
+var defaultAPIBase = js.Global().Get("location").Get("origin").String() + "/chess"