fix: run AI catalog sync as standalone script to avoid DB dependency (#18853)

## Summary
- The `ci-ai-catalog-sync` cron workflow was failing because the
`ai:sync-models-dev` NestJS command bootstraps the full app, which tries
to connect to PostgreSQL — unavailable in CI.
- Converted the sync logic to a standalone `ts-node` script
(`scripts/ai-sync-models-dev.ts`) that runs without NestJS, eliminating
the database dependency.
- Removed the `Build twenty-server` step from the workflow since it's no
longer needed, making the job faster.

## Test plan
- [x] Verified the standalone script runs successfully locally via `npx
nx run twenty-server:ts-node-no-deps-transpile-only --
./scripts/ai-sync-models-dev.ts`
- [x] Verified `--dry-run` flag works correctly
- [x] Verified the output `ai-providers.json` is correctly written with
valid JSON (135 models across 5 providers)
- [x] Verified the script passes linting with zero errors
- [ ] CI should pass without requiring a database service

Fixes:
https://github.com/twentyhq/twenty/actions/runs/23424202182/job/68135439740

Made with [Cursor](https://cursor.com)

.github/workflows/ci-ai-catalog-sync.yaml

@@ -27,11 +27,8 @@ jobs:
       - name: Build dependencies
         run: npx nx build twenty-shared
 
-      - name: Build twenty-server
-        run: npx nx build twenty-server
-
       - name: Run catalog sync
-        run: npx nx run twenty-server:command-no-deps ai:sync-models-dev
+        run: npx nx run twenty-server:ts-node-no-deps-transpile-only -- ./scripts/ai-sync-models-dev.ts
 
       - name: Check for changes
         id: changes