从 SSR 注入逻辑中移除 partner 数据

- 删除 header.html 中对 partner 字段的 SSR 注入代码
- 确保 window.__themeCommon 不再包含 partner 数据

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

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

header.html

@@ -24,9 +24,6 @@
           if (isset($themeCfg['honor'])) {
               $data['honor'] = $themeCfg['honor'];
           }
-          if (isset($themeCfg['partner'])) {
-              $data['partner'] = $themeCfg['partner'];
-          }
           if (isset($themeCfg['friendly_link'])) {
               $data['friendly_link'] = $themeCfg['friendly_link'];
           }