docs(pm): drop sunset matching-markets endpoints - #32

…ma + Market Data (#33)

Follows the blockrun-side audit of the published endpoint surface.

Removed — upstream probing (3 runs each, 2026-08-04) showed these are gone:
  /v1/pm/markets, /v1/pm/markets/listings, /v1/pm/outcomes/{predexon_id}
    410 "sunset as of 2026-07-20. Market matching is discontinued." The #32 note
    named these as the replacement for matching-markets; they were already dead
    when it was written. markets/search is the survivor, and examples now use it.
  /v1/pm/dflow/*
    404 route-not-found. The dFlow category is gone from Predexon v2.
  /api/v1/markets/*  (ecosystem table)
    Never existed as a route at all — a phantom row.

/v1/pm/sports/* is marked temporarily unavailable rather than deleted: it is
returning a consistent upstream 500, which is a partner bug, not a sunset.

Prices: every per-call figure in these docs was the customer price under the
OLD $0.002 transaction fee. It returned to $0.001 on 2026-07-29 and the docs
never moved, so all of them over-quoted:

  Predexon / Surf   0.0095 -> 0.0085   (117 occurrences)
  Exa flat          0.012  -> 0.011    · contents 0.002 -> 0.003 / URL
  Modal create      0.012  -> 0.011    · ops 0.003 -> 0.002
  RPC               0.004  -> 0.003
  Solana RPC        0.0025 -> 0.0015
  Sound effects     0.052  -> 0.0535
  Music             0.15   -> 0.151    · Live search 0.025 -> 0.026 / source
  Voice call        0.542  -> 0.541    · phone number 5.00 -> 5.001
  RealFace / Portrait / Polymarket-fund  0.012 -> 0.011
  Equities (Pyth)   0.003  -> 0.0010

The last one was not fee drift: pyth-handler.ts bills PYTH_PRICE_USD flat and
deliberately does not add the transaction fee, so the docs were 3x high.

New pages, both for services that were live with no documentation anywhere:
  api-reference/defillama.md    — 5 endpoints, TVL / yields / token prices
  api-reference/market-data.md  — the Pyth verticals, incl. which are free

x402/endpoints.md gains a DeFi Data section and per-endpoint phone pricing in
place of "returned in 402"; ecosystem.md gains the seven services it omitted.

Co-authored-by: 1bcMax <viewitter@gmail.com>