feat：图表交互

app/services/datasource_proxy.py

@@ -20,6 +20,7 @@ from urllib.parse import urljoin
 import httpx
 
 from app.core.exceptions import BizException
+from app.schemas.screen import fill_template
 
 TIMEOUT = 5.0
 MAX_BYTES = 2 * 1024 * 1024
@@ -113,6 +114,12 @@ def _clean_headers(headers: dict[str, Any] | None) -> dict[str, str]:
     return cleaned
 
 
+def fill_params(params: dict[str, Any], variables: dict[str, Any]) -> dict[str, Any]:
+    """数据源 params 的值里的 {{变量ID}} 换成变量的值，规则同前端 fillTemplate；只代入 params，
+    地址和请求头不代入：线上取数是匿名接口，代入地址就成了开放代理"""
+    return {key: fill_template(value, variables) for key, value in params.items()}
+
+
 def _query_value(value: Any) -> Any:
     return value if isinstance(value, (str, int, float, bool)) else json.dumps(value)