feat: add saved views — database table, CRUD API, migration

- New views table (id, name, filters jsonb, sort_key, is_public, creator_id)
- GET/POST/PATCH/DELETE /views endpoints
- Register views router in server

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

drizzle/migrations/meta/_journal.json

@@ -22,6 +22,13 @@
       "when": 1780904200000,
       "tag": "0002_short_custom_field_keys",
       "breakpoints": true
+    },
+    {
+      "idx": 3,
+      "version": "7",
+      "when": 1780995910694,
+      "tag": "0003_dry_caretaker",
+      "breakpoints": true
     }
   ]
-}
+}