Version economy and report output caches against runtime

[MaxGhenis]

Closes #3386

Summary

• version economy-impact cache keys and report-output reuse against the active runtime instead of only the country package version
• make report output creation idempotent and ignore stale report rows when looking for reusable outputs
• resolve stale report IDs onto current-runtime rows instead of promoting stale rows in place

Testing

• FLASK_DEBUG=1 /Users/maxghenis/PolicyEngine/policyengine-api/.venv/bin/pytest tests/unit/services/test_economy_service.py tests/unit/services/test_report_output_service.py tests/unit/test_constants.py
• uvx ruff format --check policyengine_api/constants.py policyengine_api/services/economy_service.py policyengine_api/services/report_output_service.py tests/unit/services/test_report_output_service.py tests/unit/test_constants.py

[codecov]

Codecov Report

❌ Patch coverage is 83.82353% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.58%. Comparing base (2f4cf80) to head (68bb08d).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
policyengine_api/constants.py	78.57%	3 Missing and 3 partials ⚠️
policyengine_api/services/report_output_service.py	91.89%	2 Missing and 1 partial ⚠️
policyengine_api/routes/report_output_routes.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3384      +/-   ##
==========================================
+ Coverage   72.20%   72.58%   +0.38%     
==========================================
  Files          56       56              
  Lines        2425     2477      +52     
  Branches      423      431       +8     
==========================================
+ Hits         1751     1798      +47     
- Misses        595      598       +3     
- Partials       79       81       +2     

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