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>

pyproject.toml

@@ -133,7 +133,7 @@ dependencies = [
     "pyicu>=2.15.3,<3.0.0",
     "flasgger>=0.9.7.1,<0.10.0",
     "xxhash>=3.5.0,<4.0.0",
-    "trio>=0.29.0",
+    "trio>=0.17.0,<0.29.0",
     "langfuse>=2.60.0",
     "debugpy>=1.8.13",
     "mcp>=1.9.4",
@@ -148,6 +148,7 @@ dependencies = [
     "markdownify>=1.2.0",
     "captcha>=0.7.1",
     "pip>=25.2",
+    "moodlepy>=0.23.0",
     "pypandoc>=1.16",
     "pyobvector==0.2.18",
 ]