Duplicated scoring/sorting/risk logic across provider adapters

[silicon-intern-ready]

Problem

The functions scoreOpportunity, clamp, hashOpportunity/opportunityID, sortYield, and riskOrder are copy-pasted identically across three packages:

• internal/providers/aave/client.go
• internal/providers/morpho/client.go
• internal/providers/defillama/client.go

This violates DRY and makes it easy for the implementations to drift. If the scoring formula or sort tiebreakers are updated in one provider but not the others, yield rankings will be inconsistent.

Suggested Fix

Extract shared yield scoring, sorting, and risk utilities into a common package (e.g., internal/providers/scoring/ or internal/yield/) and have all three adapters import from there.

Files Affected

• internal/providers/aave/client.go — scoreOpportunity, clamp, hashOpportunity, sortYield, riskOrder
• internal/providers/morpho/client.go — same functions
• internal/providers/defillama/client.go — same functions (named opportunityID instead of hashOpportunity)