docs: clarify agent-side vs server-side fallback adapters in CLAUDE.md

[detail-app]

Updated CLAUDE.md to distinguish between agent-side FallbackAdapter classes (in llm/, stt/, tts/ for client-side failover) and server-side fallback support in the Inference module (LiveKit Inference Gateway). The previous documentation didn't make this distinction clear, potentially causing confusion about where failover happens.

Introduced by commit 0f4cd61 (@tmshapland).

Without this clarification, agents reading CLAUDE.md might incorrectly assume all fallback logic is in one location, or developers might not understand that there are two distinct failover mechanisms: one they instantiate directly (agent-side adapters) and one provided by the inference gateway (server-side).

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