fix(plugin): WASM 集成测试自动构建 Component — OnceLock 线程安全

测试无法找到 .component.wasm 文件导致 6 个测试全部失败。
改进 wasm_path() 使用 OnceLock 保证只转换一次，
自动从编译产物通过 wasm-tools component new 生成。

crates/erp-plugin-prototype/tests/test_plugin_integration.rs

@@ -11,32 +11,48 @@
 use anyhow::Result;
 use erp_plugin_prototype::{create_engine, load_plugin};
 
-/// 获取测试插件 WASM Component 文件路径
-fn wasm_path() -> String {
-    let candidates = [
-        // 预构建的 WASM Component（通过 wasm-tools component new 生成）
-        "../../target/erp_plugin_test_sample.component.wasm".into(),
-        // 备选：绝对路径
-        format!(
-            "{}/../../target/erp_plugin_test_sample.component.wasm",
-            std::env::current_dir().unwrap().display()
-        ),
-    ];
-    for path in &candidates {
-        if std::path::Path::new(path).exists() {
-            return path.clone();
+static WASM_PATH: std::sync::OnceLock<String> = std::sync::OnceLock::new();
+
+/// 获取测试插件 WASM Component 文件路径（线程安全，只转换一次）
+fn wasm_path() -> &'static str {
+    WASM_PATH.get_or_init(|| {
+        let component_path = "../../target/erp_plugin_test_sample.component.wasm";
+        let raw_wasm =
+            "../../target/wasm32-unknown-unknown/release/erp_plugin_test_sample.wasm";
+
+        if std::path::Path::new(component_path).exists() {
+            return component_path.to_owned();
         }
-    }
-    candidates[0].clone()
+
+        if std::path::Path::new(raw_wasm).exists() {
+            let out = std::process::Command::new("wasm-tools")
+                .args(["component", "new", raw_wasm, "-o", component_path])
+                .output()
+                .expect("wasm-tools 未安装，请运行: cargo install wasm-tools");
+            if out.status.success() && std::path::Path::new(component_path).exists() {
+                return component_path.to_owned();
+            }
+            panic!(
+                "wasm-tools component new 失败: {}",
+                String::from_utf8_lossy(&out.stderr)
+            );
+        }
+
+        panic!(
+            "未找到 WASM 编译产物。请先运行:\n  \
+             cargo build -p erp-plugin-test-sample --target wasm32-unknown-unknown --release"
+        );
+    })
 }
 
 #[tokio::test]
 async fn test_v6_load_plugin_from_binary() -> Result<()> {
     let wasm_path = wasm_path();
-    let wasm_bytes = std::fs::read(&wasm_path).map_err(|e| {
+    let wasm_bytes = std::fs::read(wasm_path).map_err(|e| {
         anyhow::anyhow!(
             "读取 WASM 失败: {}。请先编译: cargo build -p erp-plugin-test-sample --target wasm32-unknown-unknown --release\n路径: {}",
-            e, wasm_path
+            e,
+            wasm_path
         )
     })?;