chore: add project config and deploy preparation

- .vps-lab-config.json for VPS lab context
- .gitattributes
- README.md
- .planning/agent-history.json

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.vps-lab-config.json

@@ -0,0 +1,20 @@
+{
+  "type": "vps-lab",
+  "project_name": "postgenerator",
+  "slug": "postgenerator",
+  "created_at": "2026-03-07T12:17:48Z",
+  "gitea": {
+    "repo_url": "https://git.mlhub.it/Michele/postgenerator",
+    "clone_url": "https://git.mlhub.it/Michele/postgenerator.git"
+  },
+  "vps": {
+    "deployed": false,
+    "url": null,
+    "container": "lab-postgenerator-app",
+    "path": "/opt/lab-postgenerator/"
+  },
+  "supabase": {
+    "enabled": false,
+    "project_ref": null
+  }
+}