feat(discovery): multi-zone endpoints, faster polls, orphan sync break

Discover CI secondary zones via _musp SRV ports, treat players as ip:port,
verify SyncStatus before caching, fail fast on dead endpoints, and ungroup
orphaned secondaries when the primary is offline.

Author: tbaur

cli.py

@@ -39,6 +39,8 @@
 
 # --- OPERATIONAL CONSTANTS ---
 BLUOS_PORT = 11000
+# BluOS mDNS: primary players (_musc) + CI secondary zones (_musp)
+BLUOS_MDNS_SERVICES = ("_musc._tcp", "_musp._tcp")
 DEFAULT_TIMEOUT = 2
 MAX_XML_SIZE = 1_048_576  # 1MB Limit
 MAX_XML_DEPTH = 20  # Maximum XML nesting depth to prevent bombs