Suggest moving `start_intent` function from `tool.ui` to `tool.app_management`

[iejzh]

Description:

The start_intent function is responsible for managing app-related intents, which aligns more with application management logic. Currently, it resides in the tool.ui module, which does not reflect its intended responsibility.

Suggestion:

• Move the start_intent function to the tool.app_management module;