feat: make SearXNG URL an environment variable

gitea/tools/research_tools.py

@@ -21,6 +21,8 @@ from typing import Any
 
 import httpx
 
+from gitea.config import SEARXNG_URL
+
 logger: logging.Logger = logging.getLogger("research-tools")
 
 _DEFAULT_TIMEOUT: int = 20
@@ -29,10 +31,9 @@ _USER_AGENT: str = (
     "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 "
     "(KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36"
 )
-# SearXNG instance — override with SEARXNG_URL env var
-_SEARXNG_URL: str = os.getenv(
-    "SEARXNG_URL", "https://searxng.meeks.freeddns.org"
-)
+# SearXNG instance
+_SEARXNG_URL: str = SEARXNG_URL
+
 
 
 class ResearchTools: