chore: 清理 emoji 与修正发布脚本仓库名

产品代码统一为纯文本风格（照参考实现），去掉 emoji：billing/quota/usage 插件、
channels 的提示文案、WebUI 文案，以及 go 测试、docs、packaging 脚本中的
注意/OK/FAIL 等符号化写法。第三方目录（vendor、node_modules、.probe）不动。

另：packaging/upload-release.sh 的仓库名改为真实全名
JianFeeeee/ModelRouter → HeNanMU-EEA/ModelRouter（前者是重定向，POST/PUT 不跟随
会 404）。

internal/lua/billing_ui_test.go

@@ -228,7 +228,7 @@ func TestBillingPageCoversItsData(t *testing.T) {
 }
 
 // TestPluginIconIsNotARawEmoji guards the sidebar icon. The billing plugin
-// declared icon = "💰" and the WebUI drops that verbatim into the button, while
+// declared icon = "" and the WebUI drops that verbatim into the button, while
 // every native tab uses an inline SVG styled with `stroke: currentColor`. An
 // emoji there renders at the wrong size and ignores the theme, so it does not
 // match its neighbours — which is what the operator reported.
@@ -335,7 +335,7 @@ func TestBillingTableHeaderMatchesRowColumns(t *testing.T) {
 	td := strings.Count(row, "</td>")
 
 	if th != td {
-		t.Errorf("★ header declares %d columns but row() emits %d cells — the "+
+		t.Errorf("header declares %d columns but row() emits %d cells — the "+
 			"table is misaligned from the first differing column on", th, td)
 	}
 }