chore: Commit current state before refactoring

Includes deleted sql/ files, seeds, and documentation files.
Prepares master for refactoring branch.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -11,9 +11,7 @@
     "db:push": "drizzle-kit push",
     "db:studio": "drizzle-kit studio",
     "db:seed": "node src/db/seeds/admin.seed.js",
-    "db:seed:testuser": "node src/db/seeds/testuser.seed.js",
-    "db:import:ai-kurzy": "node src/db/seeds/ai-kurzy-import.seed.js",
-    "db:import:ai-kurzy-csv": "node src/db/seeds/ai-kurzy-csv-import.seed.js"
+    "db:seed:testuser": "node src/db/seeds/testuser.seed.js"
   },
   "keywords": [],
   "author": "Richard Tekula",