feat: add Postman environment files for local and production setups

postman/CrowMate_Local.postman_environment.json

@@ -0,0 +1,34 @@
+{
+  "id": "crowmate-local-env",
+  "name": "CrowMate — Local",
+  "values": [
+    {
+      "key": "baseUrl",
+      "value": "http://localhost:3000",
+      "type": "default",
+      "enabled": true
+    },
+    {
+      "key": "adminEmail",
+      "value": "admin@example.com",
+      "type": "default",
+      "enabled": true
+    },
+    {
+      "key": "adminPassword",
+      "value": "change_me",
+      "type": "secret",
+      "enabled": true
+    },
+    {
+      "key": "token",
+      "value": "",
+      "type": "secret",
+      "enabled": true,
+      "description": "Auto-populated by the Login request"
+    }
+  ],
+  "_postman_variable_scope": "environment",
+  "_postman_exported_at": "2026-03-26T00:00:00.000Z",
+  "_postman_exported_using": "Claude Code"
+}