Fix model discovery to respect injected configuration

[matdev83]

Summary

• ensure the models controller keeps the injected configuration and falls back to AppConfig only when needed
• add a regression test proving custom configuration objects are honoured during model discovery

Testing

• python -m pytest (fails: requires snapshot fixture and optional tooling in the current environment)

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Codex Task

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📥 Commits

Reviewing files that changed from the base of the PR and between c03159e and 9f3fd5c.

📒 Files selected for processing (2)

• src/core/app/controllers/models_controller.py (1 hunks)
• tests/unit/test_models_endpoint.py (1 hunks)

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• Commit unit tests in branch codex/fix-architectural-issues-with-solid-principles-4w3rn5

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[chatgpt-codex-connector]

💡 Codex Review

llm-interactive-proxy/src/core/app/controllers/models_controller.py

Lines 384 to 387 in 9f3fd5c

	try:
	# Create backend instance
	backend_instance: Any = backend_factory.create_backend(
	backend_type, config

Use fallback AppConfig when injected config lacks backends

When the injected IConfig has no backends attribute, the function constructs a fallback_config = AppConfig() so model discovery can proceed, but the subsequent call to backend_factory.create_backend still passes the original config object. Any stub config without backends will therefore fail inside the factory (which expects an AppConfig) despite the fallback being available, whereas the pre-change code replaced config entirely with AppConfig(). The fallback configuration should be the one handed to the factory in this scenario.

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