Monorepo skeleton, Prisma schema, core domain and services with tests

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

infra/seaweed-s3.json

@@ -0,0 +1,9 @@
+{
+  "identities": [
+    {
+      "name": "barev",
+      "credentials": [{ "accessKey": "barev", "secretKey": "barev-secret" }],
+      "actions": ["Admin", "Read", "Write", "List", "Tagging"]
+    }
+  ]
+}