feat: add endpoint setting for text2vec-openai and text2vec-morph

[muhammadshayan124]

Summary

Adds an optional endpoint argument to text2vec-openai and text2vec-morph vectorizer configs, mirroring the endpoint field already supported by text2vec-aws. Defaults to None, which uses the server-defined default of /v1/embeddings.

Closes #2072.

Changes

• weaviate/collections/classes/config_vectorizers.py: adds endpoint: Optional[str] to _Text2VecOpenAIConfig and _Text2VecMorphConfig, and threads it through Configure.Vectorizer.text2vec_openai.
• weaviate/collections/classes/config_vectors.py: adds endpoint to Configure.Vectors.text2vec_openai and Configure.Vectors.text2vec_morph.
• weaviate/collections/classes/config_named_vectors.py: adds endpoint to Configure.NamedVectors.text2vec_openai (there is no text2vec_morph named-vector factory to update).
• test/collection/test_config.py: adds a case per updated factory asserting endpoint round-trips into the serialized module config.

Test plan

• pytest test/collection/test_config.py — 194/194 passing
• ruff check / ruff format --check on all changed files — clean
• flake8 on all changed files — clean

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[weaviate-git-bot]

To avoid any confusion in the future about your contribution to Weaviate, we work with a Contributor License Agreement. If you agree, you can simply add a comment to this PR that you agree with the CLA so that we can merge.

beep boop - the Weaviate bot 👋🤖

PS:
Are you already a member of the Weaviate Forum?