chore: apply cargo fmt across workspace and update docs

- Run cargo fmt on all Rust crates for consistent formatting
- Update CLAUDE.md with WASM plugin commands and dev.ps1 instructions
- Update wiki: add WASM plugin architecture, rewrite dev environment docs
- Minor frontend cleanup (unused imports)

crates/erp-workflow/src/engine/mod.rs

@@ -1,5 +1,5 @@
-pub mod expression;
 pub mod executor;
+pub mod expression;
 pub mod model;
 pub mod parser;
 pub mod timeout;