fix: normalize relay URLs to match applesauce-relay internal format

applesauce-relay adds trailing slashes to relay URLs without paths,
but our RELAYS config doesn't include them. This caused applyRelaySetToPool
to think they were different URLs and remove all relays except the proxy.

Now we normalize URLs before comparison to match the pool's format.

src/services/relayManager.ts

@@ -17,6 +17,24 @@ export function getActiveRelayUrls(relayPool: RelayPool): string[] {
   return prioritizeLocalRelays(urls)
 }
 
+/**
+ * Normalizes a relay URL to match what applesauce-relay stores internally
+ * Adds trailing slash for URLs without a path
+ */
+function normalizeRelayUrl(url: string): string {
+  try {
+    const parsed = new URL(url)
+    // If the pathname is empty or just "/", ensure it ends with "/"
+    if (parsed.pathname === '' || parsed.pathname === '/') {
+      return url.endsWith('/') ? url : url + '/'
+    }
+    return url
+  } catch {
+    // If URL parsing fails, return as-is
+    return url
+  }
+}
+
 /**
  * Applies a new relay set to the pool: adds missing relays, removes extras
  */
@@ -24,15 +42,17 @@ export function applyRelaySetToPool(
   relayPool: RelayPool,
   finalUrls: string[]
 ): void {
+  // Normalize all URLs to match pool's internal format
   const currentUrls = new Set(Array.from(relayPool.relays.keys()))
-  const targetUrls = new Set(finalUrls)
+  const normalizedTargetUrls = new Set(finalUrls.map(normalizeRelayUrl))
+  const targetUrlsMap = new Map(finalUrls.map(url => [normalizeRelayUrl(url), url]))
 
   console.log('[relayManager] applyRelaySetToPool called')
   console.log('[relayManager] Current pool has:', currentUrls.size, 'relays')
   console.log('[relayManager] Target has:', finalUrls.length, 'relays')
 
-  // Add new relays
-  const toAdd = finalUrls.filter(url => !currentUrls.has(url))
+  // Add new relays (use original URLs for adding, not normalized)
+  const toAdd = finalUrls.filter(url => !currentUrls.has(normalizeRelayUrl(url)))
   console.log('[relayManager] Will add:', toAdd.length, 'relays', toAdd)
   if (toAdd.length > 0) {
     relayPool.group(toAdd)
@@ -41,8 +61,15 @@ export function applyRelaySetToPool(
   // Remove relays not in target (but always keep local relays)
   const toRemove: string[] = []
   for (const url of currentUrls) {
-    if (!targetUrls.has(url) && !ALWAYS_LOCAL_RELAYS.includes(url)) {
-      toRemove.push(url)
+    // Check if this normalized URL is in the target set
+    if (!normalizedTargetUrls.has(url)) {
+      // Also check if it's a local relay (check both normalized and original forms)
+      const isLocal = ALWAYS_LOCAL_RELAYS.some(localUrl => 
+        normalizeRelayUrl(localUrl) === url || localUrl === url
+      )
+      if (!isLocal) {
+        toRemove.push(url)
+      }
     }
   }
   console.log('[relayManager] Will remove:', toRemove.length, 'relays', toRemove)