feat: bootstrap lunch picker miniapp with backend, docs, and branding assets

template/backend/.env.example

@@ -0,0 +1,15 @@
+# Backend port
+PORT=4000
+
+# MySQL mode is enabled when MYSQL_HOST or MYSQL_URL is set.
+# If neither is set, backend runs in memory mode.
+
+# Option A: full URL
+# MYSQL_URL=mysql://user:password@127.0.0.1:3306/lunch_picker
+
+# Option B: split fields
+MYSQL_HOST=127.0.0.1
+MYSQL_PORT=3306
+MYSQL_USER=root
+MYSQL_PASSWORD=secret
+MYSQL_DATABASE=lunch_picker