Feat/dybamic transfer (#521)

* feat: enable dynamic transfer destination resolution

* fix: remove approved routes, policy and fallback

* fix: review comments

api/tests/test_tool_schema.py

@@ -1,3 +1,5 @@
+import pytest
+
 from api.schemas.tool import TransferCallConfig
 
 
@@ -13,3 +15,28 @@ def test_transfer_call_destination_accepts_provider_specific_literal():
     config = TransferCallConfig(destination="provider-specific-destination")
 
     assert config.destination == "provider-specific-destination"
+
+
+def test_transfer_call_static_requires_destination():
+    with pytest.raises(ValueError, match="destination is required"):
+        TransferCallConfig(destination_source="static", destination="")
+
+
+def test_transfer_call_dynamic_requires_resolver():
+    with pytest.raises(ValueError, match="resolver is required"):
+        TransferCallConfig(destination_source="dynamic", destination="")
+
+
+def test_transfer_call_dynamic_accepts_resolver_without_destination():
+    config = TransferCallConfig(
+        destination_source="dynamic",
+        destination="",
+        resolver={
+            "type": "http",
+            "url": "https://crm.example.com/resolve-transfer",
+        },
+    )
+
+    assert config.destination_source == "dynamic"
+    assert config.destination == ""
+    assert config.resolver is not None