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-config/src/error.rs

@@ -22,9 +22,7 @@ pub enum ConfigError {
 impl From<sea_orm::TransactionError<ConfigError>> for ConfigError {
     fn from(err: sea_orm::TransactionError<ConfigError>) -> Self {
         match err {
-            sea_orm::TransactionError::Connection(err) => {
-                ConfigError::Validation(err.to_string())
-            }
+            sea_orm::TransactionError::Connection(err) => ConfigError::Validation(err.to_string()),
             sea_orm::TransactionError::Transaction(inner) => inner,
         }
     }