Security and Testing infrastructure Remediation

[Wikid82]

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Chores of this PR:

1. Migrate base image to Alpine to fix known Debian CVEs.

2. Make sure testing infrastructure has no regression and passes all green. Includes local and CI E2E, Integrations, Frontend and Backend Coverage.

DoD Checklist:

• Dockerfile updates and rebuild successful
• Confirm Integration Tests
  • Cerberus
  • CrowdSec
  • Rate Limiter
  • WAF
• E2E Runs Green
  • Security Shard
    • Chromium
    • Firefox
    • Wibkit
  • Chromium
    • Shard 1
    • Shard 2
    • Shard 3
    • Shard 4
  • Firefox
    • Shard 1
    • Shard 2
    • Shard 3
    • Shard4
  • Webkit
    • Shard 1
    • Shard 2
    • Shard 3
    • Shard 4
• Frontend runs green and meets Coverage goal
• Backend runs green and meets coverage goal
• All CI/CD are running green

Closes Issues: #40, #587, #589, #592, #610, #618, #638, #664, #665, #631

[codecov]

Codecov Report

❌ Patch coverage is 84.38991% with 229 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/internal/patchreport/patchreport.go	81.81%	33 Missing and 31 partials ⚠️
backend/internal/services/backup_service.go	83.12%	21 Missing and 19 partials ⚠️
backend/internal/api/handlers/security_handler.go	80.16%	16 Missing and 8 partials ⚠️
backend/internal/api/handlers/backup_handler.go	57.57%	13 Missing and 1 partial ⚠️
backend/internal/services/notification_service.go	68.88%	7 Missing and 7 partials ⚠️
backend/internal/services/security_service.go	40.90%	12 Missing and 1 partial ⚠️
backend/internal/api/handlers/emergency_handler.go	62.06%	7 Missing and 4 partials ⚠️
backend/cmd/localpatchreport/main.go	94.35%	6 Missing and 4 partials ⚠️
...ckend/internal/api/handlers/access_list_handler.go	43.75%	7 Missing and 2 partials ⚠️
...ackend/internal/api/handlers/proxy_host_handler.go	87.67%	6 Missing and 3 partials ⚠️
... and 6 more

📢 Thoughts on this report? Let us know!

[github-actions]

✅ Supply Chain Verification Results

✅ PASSED

📦 SBOM Summary

• Components: 1674

🔍 Vulnerability Scan

Severity	Count
🔴 Critical	0
🟠 High	0
🟡 Medium	0
🟢 Low	0
Total	0

📎 Artifacts

• SBOM (CycloneDX JSON) and Grype results available in workflow artifacts

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_{Generated by Supply Chain Verification workflow • View Details}