ci(quality): automate dead code scanning on every PR + weekly schedule

[Moeabdelaziz007]

Update dead-code-scan.sh to output JSON format:
{ "deadFiles": [], "deadExports": [], "totalLines": 0 }
Add GitHub Actions workflow for weekly and PR scans.

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PR created automatically by Jules for task 5122281877129115718 started by @Moeabdelaziz007

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