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)

Cargo.toml

@@ -8,6 +8,8 @@ members = [
     "crates/erp-message",
     "crates/erp-config",
     "crates/erp-server/migration",
+    "crates/erp-plugin-prototype",
+    "crates/erp-plugin-test-sample",
 ]
 
 [workspace.package]