Add footer; default to public explorers (proxy via localStorage opt-in)

- Footer: "made with ♥ by Adam Soltys" (links adamsoltys.com) and "source
  available on GitHub" (links the repo).
- Explorer endpoint now defaults to the public explorers; a rate-limited
  machine can opt into a proxy via localStorage('explorer-proxy'). Correct for
  a hosted multi-user deploy (each visitor uses their own IP).

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

1 files changed, 12 insertions, 3 deletions

diff --git a/src/api.js b/src/api.js
index 0135369..a91d94b 100644
--- a/src/api.js
+++ b/src/api.js
@@ -6,9 +6,18 @@
 //   - a 429 from ANY request immediately backs off ALL subsequent requests
 //     (global exponential pause), easing back as requests succeed.
 
-// TEMPORARY: route explorer traffic through a VPS while this IP is rate-limited
-// by mempool.space. Set PROXY = '' to go back to the public explorers directly.
-const PROXY = 'http://51.79.52.200:8088';
+// Explorer endpoint. Defaults to the public explorers (correct for a hosted,
+// multi-user deploy — each visitor uses their own IP). A specific machine whose
+// IP is rate-limited can opt into a proxy at runtime:
+//   localStorage.setItem('explorer-proxy', 'http://51.79.52.200:8088')
+// (http proxy only works when the page itself is served over http/localhost).
+const PROXY = (() => {
+  try {
+    return localStorage.getItem('explorer-proxy') || '';
+  } catch {
+    return '';
+  }
+})();
 
 const BACKENDS = PROXY
   ? {