feat: 业务库切换 MySQL + 修复定时任务运行详情递归与重名 500

- 业务 ORM 数据支持 MySQL 后端(asyncmy),新增 PortableJSON/
  BeijingDateTime 可移植列类型、迁移脚本与切库脚本
- 修复 GET /api/scheduled-tasks/runs/{id} 的 _load_run 无限递归
  (误调用自身,应委托 service.get_run)导致的 RecursionError 500
- 定时任务名按用户唯一:create/update/admin_update 主动校验,
  冲突抛 DuplicateTaskNameError,路由转 409 而非裸 IntegrityError 500
- 补充回归测试 test_scheduled_task_run_lookup / _name_uniqueness

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend-web/vite.config.ts

@@ -1,14 +1,13 @@
-import path from "node:path";
-import { fileURLToPath } from "node:url";
-
-import react from "@vitejs/plugin-react";
-import sourceIdentifierPlugin from "vite-plugin-source-identifier";
-import { defineConfig } from "vite";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+import react from "@vitejs/plugin-react";
+import { defineConfig } from "vite";
 
 const rootDir = fileURLToPath(new URL(".", import.meta.url));
 
-export default defineConfig({
-  plugins: [react(), sourceIdentifierPlugin()],
+export default defineConfig({
+  plugins: [react()],
   resolve: {
     alias: [
       {