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-auth/src/module.rs

@@ -101,8 +101,7 @@ impl AuthModule {
             // Position routes (nested under department)
             .route(
                 "/departments/{dept_id}/positions",
-                axum::routing::get(org_handler::list_positions)
-                    .post(org_handler::create_position),
+                axum::routing::get(org_handler::list_positions).post(org_handler::create_position),
             )
             .route(
                 "/positions/{id}",