Added min liquidity threshold

[Divljo31]

Adds a liquidity gate to TradeRouter.getSpotPrice so it returns undefined when assetIn is too thinly capitalized to be meaningfully priced. Depth is measured as maxSinglePoolBalance(assetIn) × spot[assetIn → first reachable reference stable] valued in 18-decimal units, with HOLLAR (222), USDT (10), USDC (21) as the reference set (HOLLAR first). Threshold is 10,000 HOLLAR-equivalent.

The pools with less than 10k hollar value

Changes:

• getSpotPrice rewritten to compute spot, then check depth via new private depthInUsd helper.
• Spot computation factored into computeSpotPrice so it's reusable from the depth path.
• assetMetrics helper extracts max balance and decimals across pools in one pass.
• Test fixtures: added 2↔222 (thick) and 3↔2 (thin) XYK pools; new spec asserts getSpotPrice(3, 222) is suppressed; existing graph/router specs updated for the new edges.

Issue #312

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Latest commit: 22ed352

The changes in this PR will be included in the next version bump.

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Name	Type
@galacticcouncil/sdk-next	Minor

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🧚 Live preview: galacticcouncil/hydration-ui#3789