Add Moodle data source integration (#11325)

### What problem does this PR solve?

This PR adds a native Moodle connector to sync content (courses,
resources, forums, assignments, pages, books) into RAGFlow.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

web/src/locales/en.ts

@@ -736,9 +736,15 @@ Example: https://fsn1.your-objectstorage.com`,
       google_drivePrimaryAdminTip:
         'Email address that has access to the Drive content being synced.',
       google_driveMyDriveEmailsTip:
-        'Comma-separated emails whose “My Drive” contents should be indexed (include the primary admin).',
+        'Comma-separated emails whose "My Drive" contents should be indexed (include the primary admin).',
       google_driveSharedFoldersTip:
         'Comma-separated Google Drive folder links to crawl.',
+      moodleDescription:
+        'Connect to your Moodle LMS to sync course content, forums, and resources.',
+      moodleUrlTip:
+        'The base URL of your Moodle instance (e.g., https://moodle.university.edu). Do not include /webservice or /login.',
+      moodleTokenTip:
+        'Generate a web service token in Moodle: Go to Site administration → Server → Web services → Manage tokens. The user must be enrolled in the courses you want to sync.',
       jiraDescription:
         'Connect your Jira workspace to sync issues, comments, and attachments.',
       jiraBaseUrlTip: