perf: raise the auto-denylist cap to 324,449 to cover observed floods

Distinct-source floods of 50k-250k machines are seen in practice, which
overflows a 156,437 cap. Past the cap Hold() refuses to track, so those
addresses are still disconnected by whichever gate caught them but pay full
detection cost on every reconnect instead of a cheap accept-gate deny --
the expensive path during exactly the event the list exists for.

324,449 is the next Dictionary capacity in the from-empty progression
(36,353 -> 75,431 -> 156,437 -> 324,449), so it fills one exactly. ~17 MB.

The hot-path cost barely moves: cap-triggered sweeps are throttled to one a
second, so a flood pays 0.65ms/sec, 0.065% of the loop. Only the flood-end
sweep grows, from ~2ms to ~6ms, once.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Projects/UOContent/Network/AutoDenylist/AutoDenylistConfiguration.cs

@@ -76,11 +76,12 @@ public record AutoDenylistSettings
     /// disconnected by whichever gate detected them.
     /// </summary>
     /// <remarks>
-    /// A <c>Dictionary</c> capacity, not a round number. Growing from empty it steps 36,353 → 75,431 →
-    /// 156,437, so this fills one exactly instead of stranding slots: 65,536 sat just past a resize and left
-    /// 9,895 of them (52 bytes each) unusable. Costs ~8 MB. Raising it is paid on the loop, where a full
-    /// sweep runs ~2 ms here, ~6 ms at 324,449 and ~26 ms at 968,897.
+    /// A <c>Dictionary</c> capacity, not a round number. Grown from empty it steps 36,353 → 75,431 →
+    /// 156,437 → 324,449, so this fills one exactly instead of stranding slots: 65,536 sat just past a
+    /// resize and left 9,895 of them (52 bytes each) unusable. Sized to cover the 50k–250k distinct-source
+    /// floods seen in practice, for ~17 MB. Raising it is paid on the loop, where a full sweep runs ~6 ms
+    /// here and ~26 ms at 968,897.
     /// </remarks>
     [JsonPropertyName("maxEntries")]
-    public int MaxEntries { get; set; } = 156_437;
+    public int MaxEntries { get; set; } = 324_449;
 }