[Feature]: don't depreciate --ai in favor of --integration .. keep both! ai is so much easier to type!

### Problem Statement

For those of us who still do some of the work ourselves instead of letting our clawed masters complete everything it's much nicer to use the --ai flag when setting up a new project. Switch the docs to --integration if you like but leave --ai for us old folks! My context window can't hold so many long words like integrashun. Thanks!

### Proposed Solution

Add --integrate but leave --ai as a relic for the OG users.

### Alternatives Considered

_No response_

### Component

Specify CLI (initialization, commands)

### AI Agent (if applicable)

None

### Use Cases

_No response_

### Acceptance Criteria

_No response_

### Additional Context

_No response_

从 CLI 初始化命令开始，检查现有的 --ai 和 --integration 选项是如何定义和记录的。在修改之前，先通过 issue 核实预期的拼写；完成的标准是初始化接受所请求的新别名，同时保留 --ai，并且 CLI 帮助和相关检查都反映这两个选项。

由索引模型根据 Issue 内容生成。