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Two linked fixes for MiniMax Anthropic-compatible fallback: 1. Normalize httpx.URL to str before calling .rstrip() in auth/provider detection helpers. Some client objects expose base_url as httpx.URL, not str — crashed with AttributeError in _requires_bearer_auth() and _is_third_party_anthropic_endpoint(). Also fixes _try_activate_fallback() to use the already-stringified fb_base_url instead of raw httpx.URL. 2. Strip Anthropic-proprietary thinking block signatures when targeting third-party Anthropic-compatible endpoints (MiniMax, Azure AI Foundry, self-hosted proxies). These endpoints cannot validate Anthropic's signatures and reject them with HTTP 400 'Invalid signature in thinking block'. Now threads base_url through convert_messages_to_anthropic() → build_anthropic_kwargs() so signature management is endpoint-aware. Based on PR #4945 by kshitijk4poor (rstrip fix). Fixes #4944.