refactor: Expose agent scorecard weight variables to custom configurations

[singhanurag0317-bit]

Summary

Enables weight parameters inside compute_performance_score to be customized via environment variables or explicitly passed dict arrays to adjust resolution metrics.

Changes

• Created backend/services/agent_scorecard.py with AgentScorecard class
• Configurable via SCORECARD_RESOLUTION_WEIGHT, SCORECARD_SPEED_WEIGHT, SCORECARD_QUALITY_WEIGHT, SCORECARD_VOLUME_WEIGHT, SCORECARD_SLA_WEIGHT, SCORECARD_MAX_SCORE env vars
• compute_performance_score() accepts optional per-call weight overrides via weights dict
• compare_weights() lets you compare multiple weight configurations
• Runtime update_weights() for dynamic adjustments
• Weight normalization warning when sum != 1.0
• Singleton load() / get_instance() pattern

Closes #2635

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• backend/services/agent_scorecard.py

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