Make Lynx directly callable - #5

What does this feature do?

Allows Lynx instances to be created by calling Lynx() directly, while keeping the existing Lynx.new() constructor.

Example
Before:

local app = Lynx.new()

After:

local app = Lynx() -- or Lynx.new()

Changes

• Added __call metamethod to Lynx
• Lynx() delegates to Lynx.new()
• Existing Lynx.new() behavior remains unchanged.