Depth of Market: include all quoted rates, not just those with collateral

[e35ventura]

Summary

• Depth of Market was collapsing to a single row whenever a miner's collateral was fully locked in an in-flight swap (their collateralRao reports as 0, so the entire row was filtered out). The Active Rates table kept showing the rate, so the two views disagreed.
• Keep the rate level in the orderbook grouping regardless of collateral, and add the miner's actual capacity (zero if locked). Rows with real capacity still render a depth bar; locked-out rates show as a row with no bar.

Test plan

• Open the dashboard against https://api.all-ways.io (two miners: one with active swap + 0 collateral, one with collateral).
• Depth of Market now shows both rate levels in each direction instead of one.
• Active Rates and Depth of Market reflect the same set of quoted rates.

[e35ventura]

Closing — misread the data. Only one miner has non-zero collateral, so a single row is the correct depth representation. The original filter was right.