feat: bootstrap foundation application

apps/server/internal/database/migrations/000004_attachments.up.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS attachments (
+    hash TEXT PRIMARY KEY,
+    original_name TEXT NOT NULL,
+    content_type TEXT NOT NULL,
+    size_bytes INTEGER NOT NULL,
+    created_at TEXT NOT NULL
+);
+