feat: add support for #super imports in vite-layers

vite-layers/example/apps/aurora/src/main.ts

@@ -1,4 +1,3 @@
-// Aurora has no bootstrap logic of its own — it reuses the base layer's entry.
-// `@/main.ts` resolves to *this* file first, but the layered resolver's self-skip
-// (super() semantics) falls through to the next layer, i.e. main/src/main.ts.
-import '@/main.ts'
+// Aurora has no bootstrap logic of its own — `#super` re-resolves this file's own path
+// (main.ts) from the next-lower layer, i.e. main/src/main.ts.
+import '#super'