beacon: relays page defaults to Public tab, sorted by uptime

- ui: relaysState default filter 'public', sortKey 'uptime' (desc).
- db: relaysDirectory defaults filter='public', sort='quality' so direct
  API hits match. npm test 62/62.

Closes #25

Author: melvincarvalho

public/index.html

@@ -355,7 +355,7 @@ <h2>${esc(c.name || short(pk))}</h2>
 }
 
 // ---- relay directory (firehose health data) ----
-const relaysState = { filter: 'online', sortKey: 'lastChecked', dir: -1, rows: [], meta: {} };
+const relaysState = { filter: 'public', sortKey: 'uptime', dir: -1, rows: [], meta: {} };
 const RTABS = [
   { key: 'all', label: 'All' },
   { key: 'online', label: 'Online' },

src/db.js

@@ -130,9 +130,9 @@ const RELAY_FILTERS = {
  * Read the relay-health directory in one round-trip ($facet): per-tab `counts`
  * (all/online/writable/paid/auth), the freshest `lastChecked` (freshness
  * caveat), and the filtered+sorted page. `filter` is a tab key (default
- * 'online'); `sort` is 'recent' (default), 'quality', or 'latency'.
+ * 'public'); `sort` is 'quality' (default, uptime desc), 'recent', or 'latency'.
  */
-export async function relaysDirectory({ filter = 'online', sort = 'recent', limit = 1000 } = {}) {
+export async function relaysDirectory({ filter = 'public', sort = 'quality', limit = 1000 } = {}) {
   const col = (await connect()).collection(RELAY_DIRECTORY);
   const match = RELAY_FILTERS[filter] || RELAY_FILTERS.online;
   const sortSpec = sort === 'quality' ? { uptime: -1, responseTime: 1 }