[Node] propagate auth errors from init_sync_client_with_passphrase

Swallowing WalletNotFoundError / InvalidPassphraseError hid failures from
callers. Let authenticate() raise directly so API routes can map to the
correct HTTP status.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: Herklos

octobot/community/authentication.py

@@ -709,11 +709,7 @@ def init_sync_client_with_passphrase(self, passphrase: str) -> None:
             self.logger.debug("No wallets configured, cannot initialize sync client")
             return
         admin = next((w for w in wallets if w.get("is_admin")), wallets[0])
-        try:
-            self._wallet_backend.authenticate(admin["address"], passphrase)
-        except (KeyError, ValueError) as e:
-            self.logger.error(f"Cannot init sync client with passphrase: {e}")
-            return
+        self._wallet_backend.authenticate(admin["address"], passphrase)
         self.init_sync_client_for_wallet(admin["address"])
 
     def auto_init_sync_client(self) -> bool: