fix(providers): do not force openai-strict tools for zai/ollama

[0xMink]

Closes #11404

Summary

• Remove convertToolsForOpenAI() wrapper from Z-AI and Ollama handlers, passing tools directly to convertToolsForAiSdk() instead
• The wrapper adds strict: true, forces all properties to required, and sets additionalProperties: false -- constraints that GLM and Qwen models do not support, causing malformed or missing tool call arguments
• This aligns Z-AI and Ollama handlers with the OpenRouter handler, which already passes tools directly and works correctly with these model families

Test plan

• Existing: parser tests (16/16) unaffected
• Manual: Z-AI GLM-4.7 and Ollama Qwen2.5-Coder tool execution should no longer fail with "missing nativeArgs"
• Verify: OpenRouter path unchanged (no regression)

[roomote]

Rooviewer   See task

No issues found. The change is minimal, type-safe, and consistent with the existing OpenRouter pattern that already passes tools directly to convertToolsForAiSdk(). Removing the convertToolsForOpenAI() wrapper is the correct fix for GLM and Qwen models that don't support OpenAI strict-mode tool constraints.

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