refactor(RateLimitConfig): replace magic values with struct method

src/middleware/rate_limit.rs

@@ -35,6 +35,15 @@ impl RateLimitConfig {
         }
     }
 
+    /// Return default values for disabling rate limiting.
+    #[must_use]
+    pub const fn disabled() -> Self {
+        Self {
+            burst_size: u32::MAX,
+            per_seconds: 1,
+        }
+    }
+
     /// Creates a rate limiter from this configuration.
     ///
     /// # Panics