Add embedded Express admin API and unified dev workflow.

Move admin backend into this repo (Express + MySQL on :8085) so npm run dev starts both API and Vite, with updated env defaults and Caddy config for gadm.tkmind.cn.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/load-env.mjs

@@ -0,0 +1,24 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const projectRoot = path.join(path.dirname(fileURLToPath(import.meta.url)), '..');
+
+export function loadProjectEnv() {
+  for (const file of ['.env', '.env.local']) {
+    const filePath = path.join(projectRoot, file);
+    if (!fs.existsSync(filePath)) continue;
+    for (const line of fs.readFileSync(filePath, 'utf8').split('\n')) {
+      const trimmed = line.trim();
+      if (!trimmed || trimmed.startsWith('#')) continue;
+      const eq = trimmed.indexOf('=');
+      if (eq < 0) continue;
+      const key = trimmed.slice(0, eq).trim();
+      const value = trimmed.slice(eq + 1).trim();
+      if (!process.env[key]) process.env[key] = value;
+    }
+  }
+  return projectRoot;
+}
+
+export { projectRoot };