feat: add infrastructure foundation — scripts, schema key, new routes, model fields

- Add npm scripts for dev, migrate, seed, smoke
- Add key column to scrips table (unique short identifier)
- Register users and templates routes in server
- Set development: false in Bun.serve for production mode
- Add description and custom_fields to CreateTicketSchema
- Make owner_id nullable/optional for unassigned tickets
- Add migration for custom field key column

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

drizzle/migrations/meta/_journal.json

@@ -15,6 +15,13 @@
       "when": 1780867177929,
       "tag": "0001_lovely_quentin_quire",
       "breakpoints": true
+    },
+    {
+      "idx": 2,
+      "version": "7",
+      "when": 1780904200000,
+      "tag": "0002_short_custom_field_keys",
+      "breakpoints": true
     }
   ]
-}
+}