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-message/src/handler/subscription_handler.rs

@@ -1,6 +1,6 @@
-use axum::extract::{Extension, State};
-use axum::extract::FromRef;
 use axum::Json;
+use axum::extract::FromRef;
+use axum::extract::{Extension, State};
 
 use erp_core::error::AppError;
 use erp_core::types::{ApiResponse, TenantContext};
@@ -19,13 +19,7 @@ where
     MessageState: FromRef<S>,
     S: Clone + Send + Sync + 'static,
 {
-    let resp = SubscriptionService::upsert(
-        ctx.tenant_id,
-        ctx.user_id,
-        &req,
-        &_state.db,
-    )
-    .await?;
+    let resp = SubscriptionService::upsert(ctx.tenant_id, ctx.user_id, &req, &_state.db).await?;
 
     Ok(Json(ApiResponse::ok(resp)))
 }