fix(admin): 优先级脏检查、base_url 校验、usage detail 延迟加载及导入数据验证

- 前端优先级管理: 保存时对比原始快照，仅提交实际变更的 provider/key 优先级，
  并限制并发请求数(SAVE_CONCURRENCY=6)，避免无效 API 调用
- handler_adapter_base: _normalize_test_base_url 改为 _validate_test_base_url，
  移除对 dict 类型 base_url 的兼容，严格要求字符串输入
- provider_query: 新增 _require_test_endpoint_base_url，在测试链路提前校验
  endpoint.base_url 类型和非空
- system.py: 导入 endpoint 时通过 ProviderEndpointCreate 模型校验数据，
  拒绝非法 base_url 类型(如 dict)
- usage detail: 使用 defer() 延迟加载 body 列，通过 SQL CASE 表达式在
  数据库端计算 has_*_body 标记，减少不必要的大字段传输
- provider routes: 新建 provider 时 priority=0 边界处理，clamp 并 shift

tests/unit/test_handler_adapter_base.py

@@ -4,59 +4,22 @@ from src.api.handlers.claude.adapter import ClaudeChatAdapter
 
 
 @pytest.mark.asyncio
-async def test_check_endpoint_accepts_base_url_dict(monkeypatch: pytest.MonkeyPatch) -> None:
-    captured: dict[str, object] = {}
+async def test_check_endpoint_rejects_base_url_dict() -> None:
+    with pytest.raises(TypeError, match="base_url must be a non-empty string"):
+        await ClaudeChatAdapter.check_endpoint(
+            client=None,  # type: ignore[arg-type]
+            base_url={"base_url": "https://api.anthropic.com"},  # type: ignore[arg-type]
+            api_key="test-key",
+            request_data={
+                "model": "claude-sonnet-4-5-20250929",
+                "messages": [{"role": "user", "content": "hello"}],
+                "max_tokens": 32,
+                "stream": False,
+            },
+        )
 
-    async def fake_run_endpoint_check(**kwargs):
-        captured.update(kwargs)
-        return {"status_code": 200, "headers": {}, "response_time_ms": 1, "request_id": "test"}
 
-    monkeypatch.setattr(
-        "src.api.handlers.base.endpoint_checker.run_endpoint_check",
-        fake_run_endpoint_check,
+def test_validate_test_base_url_trims_whitespace() -> None:
+    assert ClaudeChatAdapter._validate_test_base_url("  https://api.anthropic.com/v1  ") == (
+        "https://api.anthropic.com/v1"
     )
-
-    await ClaudeChatAdapter.check_endpoint(
-        client=None,
-        base_url={"base_url": "https://api.anthropic.com"},
-        api_key="test-key",
-        request_data={
-            "model": "claude-sonnet-4-5-20250929",
-            "messages": [{"role": "user", "content": "hello"}],
-            "max_tokens": 32,
-            "stream": False,
-        },
-    )
-
-    assert captured["url"] == "https://api.anthropic.com/v1/messages"
-    assert isinstance(captured["json_body"], dict)
-
-
-@pytest.mark.asyncio
-async def test_check_endpoint_accepts_url_key_in_base_url_dict(
-    monkeypatch: pytest.MonkeyPatch,
-) -> None:
-    captured: dict[str, object] = {}
-
-    async def fake_run_endpoint_check(**kwargs):
-        captured.update(kwargs)
-        return {"status_code": 200, "headers": {}, "response_time_ms": 1, "request_id": "test"}
-
-    monkeypatch.setattr(
-        "src.api.handlers.base.endpoint_checker.run_endpoint_check",
-        fake_run_endpoint_check,
-    )
-
-    await ClaudeChatAdapter.check_endpoint(
-        client=None,
-        base_url={"url": "https://api.anthropic.com/v1"},
-        api_key="test-key",
-        request_data={
-            "model": "claude-sonnet-4-5-20250929",
-            "messages": [{"role": "user", "content": "hello"}],
-            "max_tokens": 32,
-            "stream": False,
-        },
-    )
-
-    assert captured["url"] == "https://api.anthropic.com/v1/messages"