add direct http proxy support

src/app.zig

@@ -30,6 +30,7 @@ pub const App = struct {
         run_mode: RunMode,
         gc_hints: bool = false,
         tls_verify_host: bool = true,
+        http_proxy: ?std.Uri = null,
     };
 
     pub fn init(allocator: Allocator, config: Config) !*App {
@@ -54,6 +55,7 @@ pub const App = struct {
             .app_dir_path = app_dir_path,
             .notification = notification,
             .http_client = try HttpClient.init(allocator, 5, .{
+                .http_proxy = config.http_proxy,
                 .tls_verify_host = config.tls_verify_host,
             }),
             .config = config,