Soporte base_url custom en Claude adapter (MiniMax Anthropic-compatible)

MiniMax tiene endpoint compatible con Anthropic API en
https://api.minimax.io/anthropic/v1. Nueva variable
AGENTIC_ANTHROPIC_BASE_URL para usarlo.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/adapters/claude_adapter.py

@@ -17,10 +17,14 @@ logger = logging.getLogger(__name__)
 class ClaudeAdapter(ModelAdapter):
     """Adapter for the Anthropic Claude API."""
 
-    def __init__(self, api_key: str | None = None) -> None:
-        self._client = anthropic.AsyncAnthropic(
-            api_key=api_key or settings.anthropic_api_key,
-        )
+    def __init__(self, api_key: str | None = None, base_url: str | None = None) -> None:
+        kwargs: dict[str, Any] = {
+            "api_key": api_key or settings.anthropic_api_key,
+        }
+        url = base_url or settings.anthropic_base_url
+        if url:
+            kwargs["base_url"] = url
+        self._client = anthropic.AsyncAnthropic(**kwargs)
 
     # ------------------------------------------------------------------
     # Streaming