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-server/src/middleware/rate_limit.rs

@@ -15,7 +15,8 @@ struct RateLimitResponse {
     message: String,
 }
 
-/// 限流参数。
+/// 限流参数（预留配置化扩展）。
+#[allow(dead_code)]
 pub struct RateLimitConfig {
     /// 窗口内最大请求数。
     pub max_requests: u64,
@@ -74,11 +75,7 @@ async fn apply_rate_limit(
         }
     };
 
-    let count: i64 = match redis::cmd("INCR")
-        .arg(&key)
-        .query_async(&mut conn)
-        .await
-    {
+    let count: i64 = match redis::cmd("INCR").arg(&key).query_async(&mut conn).await {
         Ok(n) => n,
         Err(e) => {
             tracing::warn!(error = %e, "Redis INCR 失败，跳过限流");