feat(javascript): recover code-split bundles from multiple inputs (#1686)

* feat(javascript): recover code-split bundles from multiple inputs

recover_javascript_sources accepted a single path, and
validateModuleSet bound every module's provenance to that one snapshot.
A code-split app (runtime + chunks, or an Electron main/preload/renderer
set) had to be recovered one file per call, and modules recovered alone
could not resolve imports across chunks: cross-chunk require(id)
references stayed as numeric ids with property reads.

Add an optional additional_paths input. The listed files are
concatenated, in order after path, into the single engine snapshot, so
one Wakaru run sees every module and cross-chunk imports resolve.
validateModuleSet's single-snapshot binding is unchanged. Module
provenance is attributed back to the input file its first extraction
range starts in, with byte ranges rebased to that file's own offsets;
a module whose ranges cross an input boundary keeps the concatenated
snapshot identity and offsets, recorded as an explicit limitation.
Single-path behavior is byte-for-byte unchanged (one segment,
offset 0).

Fixes #1605

* fix(javascript): preserve source identity in multi-input recovery

---------

Co-authored-by: JingHao-Leon <w15909130000@gmail.com>
Co-authored-by: morluto <76467478+morluto@users.noreply.github.com>

scripts/fixtures/javascript-recovery/code-split/checkout.mjs

@@ -0,0 +1,6 @@
+import { Cart, formatPrice, TAX_RATE } from "./shared.mjs";
+export function checkout(prices) {
+  const cart = new Cart();
+  prices.forEach((price) => cart.add(price));
+  return formatPrice(cart.total() * (1 + TAX_RATE));
+}

scripts/fixtures/javascript-recovery/code-split/entry.mjs

@@ -0,0 +1,3 @@
+import { formatPrice } from "./shared.mjs";
+console.log(formatPrice(1));
+import("./checkout.mjs").then(({ checkout }) => console.log(checkout([1, 2])));

scripts/fixtures/javascript-recovery/code-split/shared.mjs

@@ -0,0 +1,14 @@
+export class Cart {
+  constructor() {
+    this.items = [];
+  }
+  add(price) {
+    this.items.push(price);
+    return this;
+  }
+  total() {
+    return this.items.reduce((sum, price) => sum + price, 0);
+  }
+}
+export const formatPrice = (value) => `$${value.toFixed(2)}`;
+export const TAX_RATE = 0.08;