Add f05 paid deal scaffolding

[anjor]

Summary

• add a first-class f05_paid deal type and payment metadata fields to deal models
• wire schedule handling, CLI/docs, and swagger surfaces to accept the new paid f05 path
• route f05_paid schedules through an injectable deal manager with tests for configured and unconfigured behavior

Testing

• go test ./handler/deal/schedule ./service/dealpusher
• go test ./cmd/deal/... ./handler/deal/...

Follow-ups

• implement the actual paid PoRep submission path against the Singularity f05 contract
• add wallet balance / insufficient-funds preflight checks
• add contract event tracking for paid f05 deals