Make auto-connect peers retry indefinitely on initial connection failure

Previously, static peers configured with AutoConnect gave up after 6
attempts (1 initial + 5 retries). If the remote peer was offline at
startup, the node permanently abandoned the connection. The reconnect
path (after MMP link-dead) already retried indefinitely but only
activated after a peer had been previously connected.

Remove the reconnect parameter from schedule_retry() and always set
reconnect=true when creating retry entries, since only auto-connect
peers reach this code path. The 300s backoff cap prevents resource waste.
The max_retries=0 config still works as an explicit kill switch.

src/node/handlers/timeout.rs

@@ -51,7 +51,7 @@ impl Node {
                 if conn.is_outbound()
                     && let Some(identity) = conn.expected_identity()
                 {
-                    self.schedule_retry(*identity.node_addr(), now_ms, false);
+                    self.schedule_retry(*identity.node_addr(), now_ms);
                 }
             }
             self.cleanup_stale_connection(link_id, now_ms);