feat: add local worker as llm in app

[Abirdcfly]

What type of PR is this?

/kind feature
/kind cleanup

What this PR does / why we need it

1. Use the namespace of CRDs in the same LLM application, not apiserver's pod namespace

// GetNamespace returns the namespace:
// 1. if TypedObjectReference.namespace is not nil, return it
// 2. if defaultNamespace is not empty, return it
// 3. return env: POD_NAMESPACE value, usually operator's namespace

2. add new package(Place it in an existing package get a circular dependency error) pkg/langchainwrap add two func GetLangchainLLM and GetLangchainEmbedder Convert CRD to langchain's interface.
3. app orchestration now also supports local worker llm.

Which issue(s) this PR fixes

Fixes #346

Special notes for your reviewer