style: cargo fmt across Phase 3.5 changes

Pure formatting pass — no behavior changes. Catches the line-wrapping
drift across the new authz / api_keys / middleware / handler edits
that piled up during the implementation.

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

crates/picloud/src/main.rs

@@ -100,7 +100,10 @@ async fn warn_on_multi_owner_install(users: &dyn AdminUserRepository) {
         }
         Ok(_) => {}
         Err(err) => {
-            tracing::warn!(?err, "could not count active owners for multi-owner startup check");
+            tracing::warn!(
+                ?err,
+                "could not count active owners for multi-owner startup check"
+            );
         }
     }
 }