Fix issues 182-185

[rahmanabimbs]

Closes #182,
Closes #183
Closes #184
Closes #185

Summary

This PR addresses the following contract issues:

• No total credits aggregate getter in FarmingPool #185: add an aggregate total-credits getter to FarmingPool
• get_pools_by_asset has no caching or secondary index #182: add secondary indexing for get_pools_by_asset to avoid repeated full scans
• get_boost_config returns None instead of default config for users without boost #183: return the default zero-allocation boost config for users without an explicit boost
• vesting revoke event does not include beneficiary address #184: include the beneficiary address in the vesting revoke event

Changes

• Added TotalCredits storage to the farming pool and exposed total_credits()
• Updated credit checkpoint logic to maintain a running total of all accrued credits
• Added an AssetPools(Address) secondary index in the factory
• Populated the asset index when creating pools
• Updated asset lookup logic to use the index before falling back to a bounded scan
• Changed get_boost_config to return:
  • multiplier = current global multiplier
  • allocation_pct = 0
    when no explicit boost is set
• Updated the vesting revoke event payload to include:
  • admin
  • beneficiary
  • vested
  • unvested

Notes

• This keeps API behavior aligned with the expected semantics for default boost config handling
• It also reduces repeated scanning cost for repeated get_pools_by_asset queries

Validation

• Reviewed the affected contract code paths and updated relevant tests for the new behavior
• Full Rust test execution was not possible in this environment because the Cargo toolchain is not installed here

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