Translate inventory library

[dluman]

The goal: to translate at least the ability to query a SQLite3 database from the Codespace container and receive:

• the items currently owned by the user in a JSON blob
• the presence/absence of specific items (single or multiple) per the inventory stored at API machine

The same endpoint should handle both cases (i.e. is "polymorphic") such that we can ask for (from client side):

• all (i.e. * on backend)
• one (i.e. a list containing one item)
• any set of multiples (i.e. a list containing multiple items)

[dluman]

You have full license to design DB schema. However, the minimum:

• item name
• item file
• item count
• item consumable (whether or not I can use and run out)