feat: add find_item functionality to locate items in chests

inventoryManager.lua

@@ -705,6 +705,43 @@ local function main()
                                     state.bumpStateVersion()
                                 end
                                 pcall(broadcastState)
+
+                            elseif message.type == "find_item" and message.items then
+                                -- Return chest+slot locations for the first matching item
+                                -- message.items = list of item names to search (in priority order)
+                                -- message.limit = max items to return info for (default 64)
+                                local limit = message.limit or 64
+                                local results = {}
+                                for _, itemName in ipairs(message.items) do
+                                    if cache.catalogue[itemName] then
+                                        for _, source in ipairs(cache.catalogue[itemName]) do
+                                            local chest = ops.wrapCached(source.chest)
+                                            if chest then
+                                                for slot, slotItem in pairs(chest.list()) do
+                                                    if slotItem.name == itemName then
+                                                        table.insert(results, {
+                                                            chest = source.chest,
+                                                            slot  = slot,
+                                                            name  = itemName,
+                                                            count = slotItem.count,
+                                                        })
+                                                        if #results >= limit then break end
+                                                    end
+                                                end
+                                            end
+                                            if #results >= limit then break end
+                                        end
+                                    end
+                                    if #results > 0 then break end  -- found fuel, stop searching
+                                end
+                                log.info("NET", "find_item: found %d source(s)", #results)
+                                pcall(function()
+                                    ctx.networkModem.transmit(replyChannel, cfg.ORDER_CHANNEL, {
+                                        type      = "find_item_result",
+                                        commandId = message.commandId,
+                                        results   = results,
+                                    })
+                                end)
                             end
 
                         end) -- pcall handler