Revert fix: resolve LM Studio context length detection (#5075)

[daniel-lxs]

This reverts commit ac85aa6 from PR #5076.

Changes Reverted

• Removed fetchModel() method from LmStudioHandler
• Removed models property and dynamic model fetching functionality
• Reverted getModel() method to return static defaults
• Removed tests for fetchModel() functionality
• Removed import of getLMStudioModels

Files Changed

• src/api/providers/lm-studio.ts - Reverted to original implementation
• src/api/providers/__tests__/lmstudio.spec.ts - Removed new tests and mocks

Testing

• ✅ All existing tests pass (8 tests passed)
• ✅ Type checking passes
• ✅ Linting passes

This revert restores the LM Studio handler to its previous stable state.

---

Important

Reverts dynamic model fetching in LmStudioHandler, restoring static defaults and removing related tests.

• Behavior:
  • Reverts LmStudioHandler to use static model defaults in getModel().
  • Removes fetchModel() method and dynamic model fetching.
  • Deletes tests related to fetchModel() in lmstudio.spec.ts.
• Files:
  • lm-studio.ts: Removes fetchModel() and related imports.
  • lmstudio.spec.ts: Removes tests and mocks for fetchModel().
• Testing:
  • All existing tests pass.
  • Type checking and linting pass.

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[delve-auditor]

✅ No security or compliance issues detected. Reviewed everything up to d965a24.

Security Overview

• 🔎 Scanned files: 2 changed file(s)

Detected Code Changes

Change Type	Relevant files
Refactor	► lmstudio.spec.ts     Remove LM Studio model fetching tests ► lm-studio.ts     Remove model fetching functionality     Simplify getModel() implementation

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