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/how-to/install-custom-modules.md

@@ -68,6 +68,7 @@ Select **Yes**, then provide a source:
 | Input Type            | Example                                           |
 | --------------------- | ------------------------------------------------- |
 | HTTPS URL (any host)  | `https://github.com/org/repo`                     |
+| HTTP URL (any host)   | `http://host/org/repo`                    |
 | HTTPS URL with subdir | `https://github.com/org/repo/tree/main/my-module` |
 | SSH URL               | `git@github.com:org/repo.git`                     |
 | Local path            | `/Users/me/projects/my-module`                    |

docs/vi-vn/how-to/install-custom-modules.md

@@ -68,6 +68,7 @@ Chọn **Yes**, rồi nhập nguồn:
 | Loại đầu vào | Ví dụ |
 | --------------------- | ------------------------------------------------- |
 | HTTPS URL trên bất kỳ host nào | `https://github.com/org/repo` |
+| HTTP URL trên bất kỳ host nào | `http://host/org/repo` |
 | HTTPS URL trỏ vào một thư mục con | `https://github.com/org/repo/tree/main/my-module` |
 | SSH URL | `git@github.com:org/repo.git` |
 | Đường dẫn cục bộ | `/Users/me/projects/my-module` |

docs/zh-cn/how-to/install-custom-modules.md

@@ -68,6 +68,7 @@ Would you like to install from a custom source (Git URL or local path)?
 | 输入类型 | 示例 |
 | -------- | ---- |
 | HTTPS URL（任意主机） | `https://github.com/org/repo` |
+| HTTP URL（任意主机） | `http://host/org/repo` |
 | 带子目录的 HTTPS URL | `https://github.com/org/repo/tree/main/my-module` |
 | SSH URL | `git@github.com:org/repo.git` |
 | 本地路径 | `/Users/me/projects/my-module` |

tools/installer/modules/custom-module-manager.js

@@ -24,8 +24,9 @@ class CustomModuleManager {
 
   /**
    * Parse a user-provided source input into a structured descriptor.
-   * Accepts local file paths, HTTPS Git URLs, and SSH Git URLs.
+   * Accepts local file paths, HTTPS Git URLs, HTTP Git URLs, and SSH Git URLs.
-   * For HTTPS URLs with deep paths (e.g., /tree/main/subdir), extracts the subdir.
+   * For HTTPS/HTTP URLs with deep paths (e.g., /tree/main/subdir), extracts the subdir.
+   * The original protocol (http or https) is preserved in the returned cloneUrl.
    *
    * @param {string} input - URL or local file path
    * @returns {Object} Parsed source descriptor:
@@ -127,11 +128,11 @@ class CustomModuleManager {
       };
     }
 
-    // HTTPS URL: https://host/owner/repo[/tree/branch/subdir][.git]
+    // HTTPS/HTTP URL: https://host/owner/repo[/tree/branch/subdir][.git]
-    const httpsMatch = trimmed.match(/^https?:\/\/([^/]+)\/([^/]+)\/([^/.]+?)(?:\.git)?(\/.*)?$/);
+    const httpsMatch = trimmed.match(/^(https?):\/\/([^/]+)\/([^/]+)\/([^/.]+?)(?:\.git)?(\/.*)?$/);
     if (httpsMatch) {
-      const [, host, owner, repo, remainder] = httpsMatch;
+      const [, protocol, host, owner, repo, remainder] = httpsMatch;
-      const cloneUrl = `https://${host}/${owner}/${repo}`;
+      const cloneUrl = `${protocol}://${host}/${owner}/${repo}`;
       let subdir = null;
       let urlRef = null; // branch/tag extracted from /tree/<ref>/subdir