Fix remaining clippy/formatting warnings

- Merge unnecessary line splits in db/pool.rs and pages/admin.rs
- Prefix unused variable with underscore in login.rs

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/db/pool.rs

@@ -4,8 +4,7 @@ use deadpool_postgres::{Manager, ManagerConfig, Pool, RecyclingMethod};
 use tokio_postgres::NoTls;
 
 pub static DB_POOL: LazyLock<Pool> = LazyLock::new(|| {
-    let db_url =
+    let db_url = std::env::var("DATABASE_URL").expect("DATABASE_URL environment variable not set");
-        std::env::var("DATABASE_URL").expect("DATABASE_URL environment variable not set");
     let pg_cfg = db_url
         .parse::<tokio_postgres::Config>()
         .expect("Invalid DATABASE_URL format");

src/pages/admin.rs

@@ -7,9 +7,8 @@ use crate::api::auth::{get_current_user, logout};
 
 #[component]
 pub fn AdminPage() -> Element {
-    let user_resource = use_resource(|| async move {
+    let user_resource =
-        get_current_user().await.ok().and_then(|r| r.user)
+        use_resource(|| async move { get_current_user().await.ok().and_then(|r| r.user) });
-    });
 
     let navigator = dioxus::router::navigator();
 

src/pages/login.rs

@@ -19,7 +19,7 @@ pub fn LoginPage() -> Element {
 
         spawn(async move {
             match login(username_val, password_val).await {
-                Ok(AuthResponse { success: true, token: Some(token), .. }) => {
+                Ok(AuthResponse { success: true, token: Some(_token), .. }) => {
                     // 设置 cookie (client-side, not HttpOnly but works for now)
                     #[cfg(target_arch = "wasm32")]
                     {