feat(sla): Wire SLA Auto-Escalation Background Cron Job in FastAPI Main Server (#3980)

[knoxiboy]

Description

Wires an automated SLA Auto-Escalation background cron service (backend/services/sla_service.py) that periodically sweeps active tickets for SLA target breaches and escalates overdue ticket urgency.

Related Issue

Fixes #3980

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Configuration change

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code where necessary
• I have updated the documentation accordingly
• My changes generate no new warnings
• I have added tests that prove my fix is effective or my feature works
• New and existing unit tests pass locally with my changes

Additional Notes

Includes configurable SLA time-to-first-response and resolution breach thresholds.

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