perp-fees: $1M tier, size panels follow the asset tab

[Flotapponnier]

• Harness: new $1,000,000 tier walked on the same fetched book. Deeper books where needed: Lighter top 100 levels, Polymarket depth=500, Hyperliquid falls back to nSigFigs=5 aggregation when its raw top-20 cannot absorb the tier (SOL book holds ~$450k raw). Skipped-not-extrapolated rule unchanged.
• Panels redesigned: chain label unpinned + avg() wrap, so the $100k and $1M panels follow the ETH/BTC/SOL tab instead of staying pinned to ETH. $10k panel dropped (reads within noise of $1k on every venue, verified live).
• Methodology + subtitle + seo_intro updated (Polymarket added to the venue lists, size-regime story), two FAQ entries for the $1M and ranking-flip questions.
• Independently verified against live books yesterday: HYPE at $10k/$100k/$1M reproduces the perpdexlist ranking flip.