add model to self-hosted mode

[JaredforReal]

Fix: #159

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[Copilot]

Pull request overview

Adds support for passing a model via the top-level GlmOcr(..., model=...) constructor when running in self-hosted mode, ensuring it reaches the self-hosted OCR API config.

Changes:

• Forward model constructor override to pipeline.ocr_api.model (in addition to pipeline.maas.model).
• Add a unit test asserting GlmOcr(mode="selfhosted", model=...) propagates to config_model.pipeline.ocr_api.model.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
glmocr/config.py	Updates GlmOcrConfig.from_env() to apply model override to both MaaS and self-hosted OCR API config paths.
glmocr/tests/test_unit.py	Adds a unit test covering model forwarding behavior for self-hosted mode.

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