Add tracking fields for reputation score v2

[mitp19]

• Added rsc_amount field to ScoreChange to track RSC transferred in funding events
• Added is_deleted field to ScoreChange to handle content deletion penalties
• Added score_v2 field to Score for new reputation calculation system
• Created composite index on (score, contribution_type, is_deleted) for efficient queries
• Created index on (author, hub, score_v2) for leaderboard performance

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[chatgpt-codex-connector]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.75%. Comparing base (3f11c80) to head (f31e24c).
⚠️ Report is 140 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2868      +/-   ##
==========================================
- Coverage   75.79%   75.75%   -0.04%     
==========================================
  Files         522      529       +7     
  Lines       27779    28572     +793     
==========================================
+ Hits        21054    21644     +590     
- Misses       6725     6928     +203     

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