Feature Request: Allow servers to set a custom storage inventory title

[Rafael7121]

Problem

PlayerDashboardInventoryUI always sets the storage header to the localized
"Storage" string.

Server plugins can create virtual storage using PlayerInventory.STORAGE and
sendStorage(), but there is no supported way to provide a custom display name.

For example, a server may implement a persistent virtual storage called
"Private Vault", but the native inventory interface still displays "Storage".

The current workaround is a UI Effect overlay. This does not behave like the
native header: it may not perfectly follow inventory animations, UI scaling,
opening/closing, or layout changes.

Client modules can modify the native header, but client modules are disabled
when running with BattlEye.

Proposed solution

Add an optional server-provided display name for the currently-open storage.

Possible API example:

PlayerInventory.sendStorage(string displayName = null);

Or expose a property such as:

inventory.storageDisplayName = "Private Vault";
inventory.sendStorage();

The client could use the custom value when available and fall back to the
localized "Storage" string otherwise.

The value should be cleared when the storage closes and could have a short
length limit with rich text disabled.

Benefits

• Preserves the native inventory animation and scaling.
• Works with BattlEye.
• Avoids UI Effect overlays.
• Remains backward-compatible because the default title is still "Storage".
• Useful for virtual banks, vaults, reward inventories, mailboxes, and other
  server plugin storage systems.