Fix installer custom modules http (#2344)

* fix(installer): preserve http protocol in custom module clone URLs

Previously, parseSource() hardcoded 'https://' when building cloneUrl,
forcing http:// Git URLs (e.g., internal LAN hosts) to upgrade to https.
This broke cloning for self-hosted Git servers that only serve over HTTP.

- Capture the protocol from the regex match instead of discarding it
- Update JSDoc and inline comments to document HTTP support
- Update install-custom-modules docs (EN, ZH, VN) to list HTTP URL type

Fixes the --custom-source flag for http:// addresses.

* docs(installer): update JSDoc to mention HTTP support in cloneRepo

Add HTTP to the cloneRepo method's JSDoc param description.
Also fixes minor spacing in empty arrow functions (formatting).

* docs(installer): fix JSDoc annotation for cloneRepo param

Correct @param backtick escaping in cloneRepo JSDoc.
Also documents HTTP as a supported protocol alongside HTTPS and SSH.

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Co-authored-by: 关惠民 <9155544@qq.com>