build(dwg): ship the parser wasm built on unmodified acadrust 0.6.5

The shipped wasm was built from a vendored acadrust 0.4.1 carrying local
changes in two files (read_mesh array bounds, OLE2FRAME corner decoding),
and the published read_mesh patch did not even apply to the pristine
crate, so the notice could not reproduce the source compiled into the
wasm (MPL-2.0 3.2). acadrust 0.6.5 already does both on its own: the
road-surface MESH and the C0060203 OLE2FRAME come out identical to the
patched build, so the parser now uses the crate exactly as crates.io
serves it.

The notices name 0.6.5, its upstream commit and the crate SHA-256 (equal
to the Cargo.lock checksum the build used), the stale patch file is
removed, and the page links to the crate source instead.

Verified on 22 samples, loading each with the old and the new wasm in
Chrome: all load, 17 render pixel-identical, and the 5 that differ are
0.4.1 misreads that 0.6.5 corrects. The wrapper changes this needed live
in hmwebviewer rust/dwg-wasm (branch chore/acadrust-0.6.5).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

index.html

@@ -341,10 +341,10 @@
       지도: <a href="/docs/modules-dwg-dxf.html" target="_blank">docs/modules-dwg-dxf.html</a>
     </p>
     <!-- MPL-2.0 §3.2(b): recipients of the wasm must be told where the
-         acadrust source (with our local patch) can be obtained. -->
+         acadrust source can be obtained (unmodified 0.6.5, see the notice). -->
     <p style="margin:6px 0 0">
       오픈소스 고지: <a href="/licenses/THIRD-PARTY-NOTICES.md" target="_blank">THIRD-PARTY-NOTICES</a>
-      (acadrust · MPL-2.0 · <a href="/licenses/acadrust-0.4.1-read_mesh.patch" target="_blank">local patch</a>)
+      (acadrust 0.6.5 · MPL-2.0 · <a href="https://crates.io/crates/acadrust/0.6.5" target="_blank" rel="noopener">source</a>)
     </p>
   </aside>