feat(model connection): remove manual model creation

[AnishSarkar22]

Description

Motivation and Context

FIX #

Screenshots

API Changes

• This PR includes API changes

Change Type

• Bug fix
• New feature
• Performance improvement
• Refactoring
• Documentation
• Dependency/Build system
• Breaking change
• Other (specify):

Testing Performed

• Tested locally
• Manual/QA verification

Checklist

• Follows project coding standards and conventions
• Documentation updated as needed
• Dependencies updated as needed
• No lint/build errors or new warnings
• All relevant tests are passing

High-level PR Summary

This PR fixes an issue with LM Studio integration by providing a dummy API key value ("not-needed") when no API key is configured. LM Studio accepts unauthenticated local requests, but the LiteLLM OpenAI-compatible adapter requires an api_key parameter to be present. The fix includes a conditional check that supplies the placeholder value specifically for the lm_studio provider when the API key is empty, along with a corresponding unit test to verify the behavior.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_backend/tests/unit/services/test_model_connections.py
2	surfsense_backend/app/services/model_resolver.py

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