feat(server,web,desktop): admin "use system HTTP proxy" switch (#225)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -264,6 +264,9 @@ importers:
       tar:
         specifier: ^7.5.21
         version: 7.5.22
+      undici:
+        specifier: ^7.29.0
+        version: 7.29.0
       yaml:
         specifier: ^2.5.0
         version: 2.9.0
@@ -7279,8 +7282,7 @@ snapshots:
 
   undici@6.28.0: {}
 
-  undici@7.29.0:
-    optional: true
+  undici@7.29.0: {}
 
   unified@11.0.5:
     dependencies: