Fix prod-to-local sync for self-hosted Convex compatibility

Convex cloud now exports "uniform" schema types and $bytes fields that
self-hosted Convex can't import. Sanitize the snapshot by stripping
generated_schema.jsonl files and resend component data before importing.
Also update convex CLI from 1.28.0 to 1.33.0.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: prazgaitis

packages/backend/package.json

@@ -62,7 +62,7 @@
     "@convex-dev/migrations": "^0.3.1",
     "@convex-dev/resend": "^0.2.3",
     "@noble/hashes": "^2.0.1",
-    "convex": "^1.28.0",
+    "convex": "^1.33.1",
     "stripe": "^20.0.0"
   },
   "devDependencies": {