refactor: remove modules system and fix indentation

Setting a "standard" module and resource structure is too limiting, so stick to import only.

imports/callbacks/client.lua

@@ -1,13 +1,13 @@
 local ServerCallbacks = {}
 
 local function CallbackTimer(event, delay)
-    if type(delay) == 'number' then
-        local time = GetGameTimer()
-        if (ServerCallbacks[event] or 0) > time then
-            return false
-        end
-        ServerCallbacks[event] = time + delay
-    end
+	if type(delay) == 'number' then
+		local time = GetGameTimer()
+		if (ServerCallbacks[event] or 0) > time then
+			return false
+		end
+		ServerCallbacks[event] = time + delay
+	end
 end
 
 local ServerCallback = table.create(0, 2)
@@ -16,28 +16,28 @@ local ServerCallback = table.create(0, 2)
 ---@param event string
 ---@param delay number
 ServerCallback.Await = function(resource, event, delay, ...)
-    CallbackTimer(event, delay)
-    event = ('__cb_%s:%s'):format(resource, event)
-    TriggerServerEvent(event, ...)
-    local promise = promise.new()
-    event = RegisterNetEvent(event, function(...)
-        promise:resolve({...})
-        RemoveEventHandler(event)
-    end)
-    return table.unpack(Citizen.Await(promise))
+	CallbackTimer(event, delay)
+	event = ('__cb_%s:%s'):format(resource, event)
+	TriggerServerEvent(event, ...)
+	local promise = promise.new()
+	event = RegisterNetEvent(event, function(...)
+		promise:resolve({...})
+		RemoveEventHandler(event)
+	end)
+	return table.unpack(Citizen.Await(promise))
 end
 
 --- Sends an event to the server and triggers a callback function once the response is returned.
 ---@param event string
 ---@param delay number
 ServerCallback.Async = function(resource, event, delay, cb, ...)
-    CallbackTimer(event, delay)
-    event = ('__cb_%s:%s'):format(resource, event)
-    TriggerServerEvent(event, ...)
-    event = RegisterNetEvent(event, function(...)
-        cb(...)
-        RemoveEventHandler(event)
-    end)
+	CallbackTimer(event, delay)
+	event = ('__cb_%s:%s'):format(resource, event)
+	TriggerServerEvent(event, ...)
+	event = RegisterNetEvent(event, function(...)
+		cb(...)
+		RemoveEventHandler(event)
+	end)
 end
 
 return ServerCallback