* feat(seekdb): add Seekdb file and vector stores with pyseekdb>=1.2.0
* refactor(seekdb): add pyseekdb_conn and remote-only host/port config
* refactor(embedding): remove env fallbacks from BaseEmbeddingModel; pass credentials in tests
* refactor(seekdb): drop tenant from client kwargs; default database test and empty password
* fix(deps): gate pyseekdb to Python >=3.11 for CI 3.10 compatibility
* fix(seekdb): satisfy pre-commit pylint and formatting for seekdb stores
* feat(vector_store): add OceanBase as a VectorStore
* refactor(obvec): make it cleaner
* docs: add obvec related info
* refactor: minor update
* refactor: clean code and pass lint
* docs: remove unrelated edit
* docs: minor update