fix: remove ANTHROPIC_BASE_URL env var to avoid collisions (#1675)

ANTHROPIC_BASE_URL collides with Claude Code and other Anthropic
tooling. Remove it from the Anthropic provider — base URL overrides
should go through config.yaml model.base_url instead.

The Alibaba/DashScope provider has its own dedicated base URL and
API key env vars which don't collide with anything.

hermes_cli/runtime_provider.py

@@ -276,12 +276,10 @@ def resolve_runtime_provider(
                 "No Anthropic credentials found. Set ANTHROPIC_TOKEN or ANTHROPIC_API_KEY, "
                 "run 'claude setup-token', or authenticate with 'claude /login'."
             )
-        # Support custom Anthropic-compatible endpoints via ANTHROPIC_BASE_URL
-        base_url = os.getenv("ANTHROPIC_BASE_URL", "").strip() or "https://api.anthropic.com"
         return {
             "provider": "anthropic",
             "api_mode": "anthropic_messages",
-            "base_url": base_url,
+            "base_url": "https://api.anthropic.com",
             "api_key": token,
             "source": "env",
             "requested_provider": requested_provider,