fix(auth): drop duplicate pixelle_video field in test AppConfig

The test AppConfig initializer in routes::auth listed pixelle_video twice
(a merge artifact from stacking the Gemini and comfy-cloud branches), which
made the lib test binary fail to compile with E0062 and blocked `cargo test
--lib` for the whole crate. Remove the duplicate; lib tests build again.

src/routes/auth.rs

@@ -1045,7 +1045,6 @@ mod tests {
                     template_proxy_url: None,
                 },
                 comfyui: Default::default(),
-                pixelle_video: Default::default(),
                 payment: Default::default(),
                 jimeng: Default::default(),
             },