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851df79a82
All native LLM providers built their SDK clients inside `@model_validator(mode="after")`, which required the API key at `LLM(...)` construction time. Instantiating an LLM at module scope (e.g. `chat_llm=LLM(model="openai/gpt-4o-mini")` on a `@crew` method) crashed during downstream crew-metadata extraction with a confusing `ImportError: Error importing native provider: 1 validation error...` before the process env vars were ever consulted. Wrap eager client construction in a try/except in each provider and add `_get_sync_client` / `_get_async_client` methods that build on first use. OpenAI call sites are routed through the lazy getters so calls made without eager construction still work. The descriptive "X_API_KEY is required" errors are re-raised from the lazy path at first real call. Update two Azure tests that asserted the old eager-error contract to assert the new lazy-error contract.