fix(rag): improve local LlamaIndex pipeline compatibility

[evan188199-tech]

Description

Improves compatibility and error reporting for local LlamaIndex ingestion pipelines.

• Adds local-provider error classification for connection and authentication failures.
• Makes LlamaIndex pipeline settings tolerate supported local configurations without assuming hosted-provider defaults.
• Preserves compatible transformation/storage behavior across current LlamaIndex versions.
• Extends ingestion tests for local pipeline compatibility and progress behavior.

Related Issues

• No existing upstream issue found; this is a focused compatibility fix.

Module(s) Affected

• agents
• api
• config
• core
• knowledge
• logging
• services
• tools
• utils
• web (Frontend)
• docs (Documentation)
• scripts
• tests
• Other: ...

Checklist

• I have read and followed the contribution guidelines.
• My code follows the project's coding standards.
• I have run pre-commit run --all-files and fixed any issues.
• I have added relevant tests for my changes.
• I have updated the documentation (if necessary).
• My changes do not introduce any new security vulnerabilities.

Validation

• Python 3.11.15
• pytest -q tests/services/rag/test_llamaindex_ingestion.py: 3 passed
• ruff check on all changed Python files: PASS
• ruff format --check on all changed Python files: PASS
• git diff --check origin/dev..HEAD: PASS
• Full repository pre-commit was not run in this local environment; the changed-file checks above all passed.