Fix Activity initialization order to prevent docById ReferenceError

[the-shreyash]

Fixes ReferenceError: docById is not defined during Activity initialization.

Root Cause

Activity was instantiated before AMD dependencies (including utils/utils, where docById is defined) were fully loaded.

The line:

const activity = new Activity();

was executed outside the define(MYDEFINES, ...) block, causing constructor execution before module initialization completed.

Fix

Moved new Activity() inside the define(MYDEFINES, ...) callback to ensure proper dependency loading before constructor execution.

Result

Eliminates docById ReferenceError

Ensures correct AMD module lifecycle

Prevents early execution during initialization

Closes #507