RSS API 地址全部收敛到 hugo.toml [params.rssapi]，切到 api.200181.xyz

- 新增 [params.rssapi] base 配置，主题 7 处硬编码改为读配置：
  head(preconnect+window.rssApiBase)、footer(构建时拉 links/feeds)、
  render-link(favicon)、circles/links 页 fetch、linkify.js(读 window.rssApiBase)
- scripts/fetch_greetings.js 支持 RSS_API_BASE 环境变量，默认新地址
- scfapi.usj.cc（国内代理）保持不变

hugo.toml

@@ -190,6 +190,13 @@ hasCJKLanguage = true
     emoticons = "/emotion/OwO.json"
     gravatar = "https://cravatar.cn/avatar/"
 
+  # ----------------------------------------------------------------------------
+  # RSS 聚合服务 (rss-robot-cf：订阅/友链/文章/图标)
+  # ----------------------------------------------------------------------------
+  [params.rssapi]
+    # 2026-10-02 从 EdgeOne (https://api.usj.cc) 迁到 Cloudflare Workers
+    base = "https://api.200181.xyz"
+
   # ----------------------------------------------------------------------------
   # 弹幕配置 (Barrage Configuration)
   # ----------------------------------------------------------------------------