feat(rules): 条件系统增强，支持 all/any 组合条件和 original/current 数据源切换

- evaluate_condition 支持递归 all/any 组合节点和 source 字段
- header_rules 支持 condition 条件触发，HeaderBuilder.apply_rules 透传 body/original_body
- 提取 EndpointConditionEditor 组件统一请求头/请求体规则的条件编辑 UI
- header_rules 新增服务端结构校验（action/key/from/to/condition）
- 新增组合条件、source 切换、fail-closed 等测试用例

tests/unit/test_endpoint_models.py

@@ -0,0 +1,94 @@
+import pytest
+from pydantic import ValidationError
+
+from src.models.endpoint_models import ProviderEndpointCreate, ProviderEndpointUpdate
+
+
+def test_provider_endpoint_models_accept_nested_conditions_and_source() -> None:
+    payload = {
+        "provider_id": "provider-1",
+        "api_format": "openai:chat",
+        "base_url": "https://api.example.com",
+        "header_rules": [
+            {
+                "action": "set",
+                "key": "X-Test",
+                "value": "1",
+                "condition": {
+                    "all": [
+                        {"path": "mode", "op": "eq", "value": "prod", "source": "original"},
+                        {
+                            "any": [
+                                {"path": "tier", "op": "eq", "value": "gold"},
+                                {"path": "tier", "op": "eq", "value": "silver"},
+                            ]
+                        },
+                    ]
+                },
+            }
+        ],
+        "body_rules": [
+            {
+                "action": "set",
+                "path": "metadata.enabled",
+                "value": True,
+                "condition": {
+                    "all": [
+                        {"path": "metadata.kind", "op": "eq", "value": "chat"},
+                        {"path": "metadata.tags", "op": "contains", "value": "vip"},
+                    ]
+                },
+            }
+        ],
+    }
+
+    created = ProviderEndpointCreate(**payload)
+    updated = ProviderEndpointUpdate(
+        header_rules=payload["header_rules"],
+        body_rules=payload["body_rules"],
+    )
+
+    assert created.header_rules == payload["header_rules"]
+    assert created.body_rules == payload["body_rules"]
+    assert updated.header_rules == payload["header_rules"]
+    assert updated.body_rules == payload["body_rules"]
+
+
+@pytest.mark.parametrize(
+    ("field_name", "rules"),
+    [
+        (
+            "header_rules",
+            [
+                {
+                    "action": "set",
+                    "key": "X-Test",
+                    "value": "1",
+                    "condition": {"path": "mode", "op": "eq", "value": "prod", "source": "bad"},
+                }
+            ],
+        ),
+        (
+            "body_rules",
+            [
+                {
+                    "action": "set",
+                    "path": "metadata.enabled",
+                    "value": True,
+                    "condition": {"all": []},
+                }
+            ],
+        ),
+    ],
+)
+def test_provider_endpoint_models_reject_invalid_condition_shapes(
+    field_name: str,
+    rules: list[dict],
+) -> None:
+    with pytest.raises(ValidationError):
+        ProviderEndpointCreate(
+            provider_id="provider-1",
+            api_format="openai:chat",
+            base_url="https://api.example.com",
+            **{field_name: rules},
+        )