Implement PDP schedule execution path and config wiring

[anjor]

Summary

• implement an executable PDP scheduling path in deal-pusher (runPDPSchedule) with sequencing: proof-set ensure -> root queue -> tx confirmation -> deal persistence
• add configurable PDP scheduling parameters to run deal-pusher flags: pdp-batch-size, pdp-gas-limit, pdp-confirmation-depth, pdp-poll-interval
• add DealPusher option hooks for PDP dependencies/config and switch default schedule deal-type inference to delegated provider addresses
• expand wiring tests to validate PDP scheduling behavior and default deal-type inference

Validation

• go test ./service/dealpusher
• go test ./cmd/run

[parkan]

based on test failure let's park this momentarily while I push up the work related to wallet extraction from db, early next week

[parkan]

see #622 and data-preservation-programs/go-synapse#4

both need work but I need to sign off for the week

[parkan]

a few changes needed here to cleanly separate the Actor and Wallet concepts:

• schedule.Preparation.Wallets → schedule.Preparation.Actors (or add a separate Wallet association on Preparation for PDP)
• EnsureProofSet / QueueAddRoots now take signer.EVMSigner — caller resolves wallet→keystore→EVMSigner before calling
• model.Wallet no longer has PrivateKey inline — use keystore.EVMSigner(ks, wallet) to get a signer
• The WalletChooser picks actors (for market deals); PDP path needs a different resolution to get a wallet+signer

these are basically the changes from #621 (comment) that I mentioned as critical