chore(pm): vendor the Aramesh/PM platform under pm/ (squash of Aramesh/PM @ 91f3271)

The PM panel (PmPanelPage -> iframe /pm/) needs the project-management
platform served at /pm/ on the ERP domain. Source: org repo Aramesh/PM,
branch feature/project-management-platform. Update via:
git subtree pull --prefix=pm aramesh-pm feature/project-management-platform --squash

pm/frontend/vite.config.ts

@@ -0,0 +1,20 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+import tailwindcss from "@tailwindcss/vite";
+
+// PM زیر مسیر /pm/ روی همان دامنه ERP سرو می‌شود (پنل «مدیریت پروژه» داخل ERP)
+export default defineConfig({
+  plugins: [react(), tailwindcss()],
+  base: "/pm/",
+  server: {
+    port: 5173,
+    // در حالت dev، درخواست‌های /pm/api به بک‌اند PM (پورت 8083) پراکسی می‌شوند
+    proxy: {
+      "/pm/api": {
+        target: "http://localhost:8083",
+        changeOrigin: true,
+        rewrite: (p) => p.replace(/^\/pm/, ""),
+      },
+    },
+  },
+});