fix(cli): db-reset now drops swarm_hosts + decky_shards

_DB_RESET_TABLES was missing the swarm tables, so drop-tables mode left
them intact. create_all doesn't alter columns on existing tables, so any
schema change to SwarmHost (like use_ipvlan) never took effect after a
reset. Child FK first (decky_shards -> swarm_hosts).

decnet/cli.py

@@ -1627,13 +1627,17 @@ def sniffer_cmd(
 
 
 _DB_RESET_TABLES: tuple[str, ...] = (
-    # Order matters for DROP TABLE: attacker_behavior FK-references attackers.
+    # Order matters for DROP TABLE: child FKs first.
+    # - attacker_behavior FK-references attackers.
+    # - decky_shards FK-references swarm_hosts.
     "attacker_behavior",
     "attackers",
     "logs",
     "bounty",
     "state",
     "users",
+    "decky_shards",
+    "swarm_hosts",
 )