fix(scene): hatch pattern scale and per-entity annotative check

- Hatch pattern_scale multiplied by annotation_scale in model space so
  pattern density stays consistent when CANNOSCALE changes
- Annotative check now uses AcAnnoPO xdata (R2007+ marker) instead of
  relying solely on group-code-293 flag; falls back to is_annotative
  for files with no xdata (old DXF backward compat)
- acadrust patched to local path for is_annotative field

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Cargo.toml

@@ -23,4 +23,4 @@ rayon = "1"
 windows-sys = { version = "0.59", features = ["Win32_UI_Shell", "Win32_UI_WindowsAndMessaging"] }
 
 [patch.crates-io]
-acadrust = { git = "https://github.com/HakanSeven12/acadrust.git", branch = "feat/layout-paper-dimensions" }
+acadrust = { path = "../acadrust" }