feat: add crabrl-fork to workspace and fix taxonomy loading

- Add crabrl-fork to workspace Cargo.toml
- Update fiscal-xbrl-core to use local crabrl-fork
- Fix SurfaceFormulaOp enum: add Divide variant
- Fix SurfaceSignTransform enum: add Absolute variant
- Implement divide_formula_values function for SurfaceFormulaOp::Divide
- Implement Absolute sign transform handler
- Fix all taxonomy_loader and related tests to pass

rust/Cargo.toml

@@ -1,5 +1,6 @@
 [workspace]
 members = [
+  "crabrl-fork",
   "fiscal-xbrl-core",
   "fiscal-xbrl-cli"
 ]
@@ -12,7 +13,9 @@ version = "0.1.0"
 
 [workspace.dependencies]
 anyhow = "1.0"
+compact_str = "0.8"
 once_cell = "1.21"
+quick-xml = "0.36"
 regex = "1.11"
 reqwest = { version = "0.12", default-features = false, features = ["blocking", "json", "rustls-tls"] }
 serde = { version = "1.0", features = ["derive"] }