Support multiple configured endpoint URLs

[i386]

What changed

• Support one or more endpoint URLs through MESH_LLM_PLUGIN_URLS.
• Preserve the existing MESH_LLM_PLUGIN_URL single-endpoint contract.
• Assign backward-compatible endpoint IDs for one URL and deterministic IDs for multiple URLs.
• Validate empty URLs and duplicate endpoint IDs.
• Document the coordinated urls = [...] mesh-llm configuration and authentication design considerations.

Why

The plugin previously emitted exactly one inference endpoint, which prevented a single plugin instance from representing multiple OpenAI-compatible backends.

Validation

• cargo fmt --check
• cargo test
• git diff --check

The corresponding mesh-llm host-runtime change is in the coordinated mesh-llm PR.

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch agent/plugin-urls

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