fix: remove error.message leak from cron routes to prevent internal detail exposure

[tmdeveloper007]

Summary

Fixes error message leakage in two cron routes that returned raw error details in HTTP 500 responses.

Files changed:

• app/api/cron/db-backup/route.ts - removed details: error?.message from 500 response
• app/api/cron/weekly-digest/route.ts - replaced error: error.message with a generic message

Security impact: Exposing internal error messages can reveal implementation details, file paths, and stack traces to potential attackers.

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⚠️ GSSoC Quality Check Failed — PR #2572

Hi @tmdeveloper007! 👋 Your PR has been flagged by our automated GSSoC quality check.

Issues found:

• 🔗 No linked issue — Every PR must be linked to an open issue. Add closes #<issue-number> or fixes #<issue-number> in your description so maintainers know what this PR resolves.

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2. Edit your PR title and description to address them
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GSSoC'26 automation · Maintainer: @nisshchayarathi

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 0ab9bc9a-37c9-4592-b7fa-db6278813e55

📥 Commits

Reviewing files that changed from the base of the PR and between 07ceab7 and 5c9f540.

📒 Files selected for processing (7)

• app/api/cron/db-backup/route.ts
• app/api/cron/weekly-digest/route.ts
• lib/services/bitbucketService.ts
• lib/services/gitlabService.ts
• src/components/repository/ContributorIssueRecommendations.tsx
• src/components/repository/RepositoryInsights.tsx
• src/components/visualizations/CodeDependencyGraph.tsx

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