contract: Integrate Dispute History Weighting into Cumulative Score

[Uche44]

Closes #397

• Profile struct updated with disputes and badge_level fields per role
• AuthorizedContract storage key added to DataKey enum
• set_authorized_contract / is_authorized_contract implemented
• check_authorized_caller helper gates all privileged writes
• increment_disputes implemented with event emission
• Fixed-point dispute decay implemented in calculate_decayed_score
• upgrade_badge / get_badge_level implemented with validation
• get_score and query_reputation return dispute + badge data with decay applied
• 22 unit tests passing (0 failures, 1 minor warning fixed)

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