feat(plugin): Schema 缓存 — moka LRU Cache 消除 resolve_entity_info 重复查库

- 添加 moka 0.12 依赖到 erp-plugin 和 erp-server
- 重写 state.rs: 新增 EntityInfo (含 generated_fields) 和 moka Cache
- AppState 新增 plugin_entity_cache 字段
- data_service.rs: 旧 resolve_entity_info 保留兼容，新增 resolve_entity_info_cached

crates/erp-server/src/main.rs

@@ -371,6 +371,10 @@ async fn main() -> anyhow::Result<()> {
         redis: redis_client.clone(),
         default_tenant_id,
         plugin_engine,
+        plugin_entity_cache: moka::sync::Cache::builder()
+            .max_capacity(1000)
+            .time_to_idle(std::time::Duration::from_secs(300))
+            .build(),
     };
 
     // --- Build the router ---