feat: botfights, discover, mobile gamepad, content handler, package config updates

Miscellaneous improvements: botfights manifest, discover page curated
apps, mobile gamepad enhancements, content HTTP handler, package
install config updates, health monitor tweaks, shared content UI,
container specs and image version updates.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

core/archipelago/src/api/handler/mod.rs

@@ -205,6 +205,11 @@ impl ApiHandler {
                 Self::handle_node_message(body_bytes).await
             }
 
+            // Content preview — degraded previews for paid content (no auth, no payment)
+            (Method::GET, p) if p.starts_with("/content/") && p.ends_with("/preview") => {
+                Self::handle_content_preview(p, &self.config).await
+            }
+
             // Content serving — peers access shared content over Tor (no session auth)
             (Method::GET, p) if p.starts_with("/content/") => {
                 Self::handle_content_request(p, &headers, &self.config).await