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-plugin-test-sample/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "erp-plugin-test-sample"
+version = "0.1.0"
+edition = "2024"
+description = "WASM 插件系统原型验证 — 测试插件"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wit-bindgen = "0.55"
+serde = { workspace = true }
+serde_json = { workspace = true }