feat(shed): lotus-shed miner list-balances

[rvagg]

I threw this together just cause I wanted some quick stats but it's a pattern I've had to do a couple of times so having this in shed might make for a good example.

[Copilot]

Pull Request Overview

This PR introduces the "list-balances" command to lotus-shed to provide a quick overview of miner balances and their quality adjusted power.

• Added a new command (minerListBalancesCmd) to list miner balances along with QAP data.
• Integrated the "must" helper and iterates over miner claims to compute and display the lowest balance encountered.

Comments suppressed due to low confidence (2)

cmd/lotus-shed/miner.go:915

• [nitpick] Consider renaming 'lowest' to 'minBalance' to more clearly indicate that this variable tracks the minimum available balance across miners.

if lowest == nil || balance.LessThan(*lowest) {

cmd/lotus-shed/miner.go:903

• [nitpick] Consider refining this header output to ensure that the CSV formatting is clear, such as by explicitly defining delimiters or quoting fields if needed.

fmt.Printf("Miner Address,QAP (bytes),Available Balance (FIL)\n")