Add memoryCost method to CompressedVariant for consistency

Make CompressedVariant consistent with AnyBlob and Headers by giving it
its own memoryCost() method instead of accessing .data.len directly.

This makes the code more maintainable and consistent with how other
types in StaticRoute report their memory usage.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/bun.js/api/server/StaticRoute.zig

@@ -14,6 +14,10 @@ pub const CompressedVariant = struct {
     pub fn deinit(this: *CompressedVariant, allocator: std.mem.Allocator) void {
         allocator.free(this.data);
     }
+
+    pub fn memoryCost(this: *const CompressedVariant) usize {
+        return this.data.len;
+    }
 };
 
 pub const CompressionFailed = struct {};
@@ -120,27 +124,31 @@ pub fn clone(this: *StaticRoute, globalThis: *jsc.JSGlobalObject) !*StaticRoute
     });
 }
 
-pub fn memoryCost(this: *const StaticRoute) usize {
-    var cost = @sizeOf(StaticRoute) + this.blob.memoryCost() + this.headers.memoryCost();
+fn compressedMemoryCost(this: *const StaticRoute) usize {
+    var cost: usize = 0;
     switch (this.compressed_br) {
-        .cached => |variant| cost += variant.data.len,
+        .cached => |variant| cost += variant.memoryCost(),
         else => {},
     }
     switch (this.compressed_gzip) {
-        .cached => |variant| cost += variant.data.len,
+        .cached => |variant| cost += variant.memoryCost(),
         else => {},
     }
     switch (this.compressed_zstd) {
-        .cached => |variant| cost += variant.data.len,
+        .cached => |variant| cost += variant.memoryCost(),
         else => {},
     }
     switch (this.compressed_deflate) {
-        .cached => |variant| cost += variant.data.len,
+        .cached => |variant| cost += variant.memoryCost(),
         else => {},
     }
     return cost;
 }
 
+pub fn memoryCost(this: *const StaticRoute) usize {
+    return @sizeOf(StaticRoute) + this.blob.memoryCost() + this.headers.memoryCost() + this.compressedMemoryCost();
+}
+
 pub fn fromJS(globalThis: *jsc.JSGlobalObject, argument: jsc.JSValue) bun.JSError!?*StaticRoute {
     if (argument.as(jsc.WebCore.Response)) |response| {