Rename system to 糖果短剧 and use new logo

Update the admin title across the login page, header, welcome page and
document title. Replace the favicon (64x64) and header logo (192x192)
with the 糖果短剧 icon.

Also picks up the deploy path fix in prod_build.sh (/server/tangguo).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

public/index.html

@@ -6,7 +6,7 @@
   <meta http-equiv="X-UA-Compatible" content="IE=edge" />
   <meta name="viewport" content="width=device-width,initial-scale=1.0" />
   <link rel="icon" type="image/png" href="<%= BASE_URL %>logo.png" />
-  <title>91fans后台管理系统</title>
+  <title>糖果短剧后台管理系统</title>
 </head>
 
 <body>