refactor(nexus/backend): remove 'any' cast for webhookDeadLetter access

[Adityavanjre]

Removes the unnecessary (this.prisma as any) type cast when accessing webhookDeadLetter in the WebhookDlqProcessor. This improves code health and enables TypeScript to properly type-check the Prisma model access and operations.

[chatgpt-codex-connector]

💡 Codex Review

ERP/package-lock.json

Lines 485 to 487 in 04fd924

	"nexus/desktop/node_modules/typescript": {
	"version": "6.0.3",
	"dev": true,

Preserve lockfile checksum/source metadata

This lockfile rewrite drops resolved and integrity metadata from many registry entries (for example this typescript entry), which weakens reproducibility and artifact verification during installs. npm lockfiles use these fields to pin tarball source/checksum; without them, installs can fall back to registry resolution behavior and lose hash validation guarantees, which is risky in CI/private-registry environments and makes dependency provenance harder to audit.

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