feat(chain): add robinhood support; disable monad/megaeth/hyperevm/tron

Add robinhood as a supported chain across the CLI and skills, and stop
advertising chains that are not publicly supported yet.

robinhood:
- validate.ts: add to VALID_CHAINS and treat as EVM for address checks
- reject guards for commands that do not support it: track kol,
  track smartmoney, cooking create (mirrors market signal)
- --chain help updated for supported commands (token/portfolio/swap/
  market kline·trending·trenches·hot-searches/track follow-*/order get/
  gas-price); OpenApiClient chain comment
- docs: all SKILL.md, Readme.md, Readme.zh.md (split-out row for
  unsupported commands), cli-usage.md, plugin/marketplace descriptions

disable monad/megaeth/hyperevm/tron:
- comment monad out of VALID_CHAINS (kept for quick re-enable)
- strip these chains from all --chain help, SKILL.md, cli-usage.md
  (hot-searches default now 4 chains: sol/bsc/base/eth)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Readme.md

@@ -726,9 +726,11 @@ gmgn-cli cooking \
 
 | Commands | Chains | Chain Currencies |
 |----------|--------|-----------------|
-| token / market / portfolio / track | `sol` / `bsc` / `base` / `eth` | — |
-| swap / order | `sol` / `bsc` / `base` / `eth` | sol: SOL, USDC · bsc: BNB, USDC · base: ETH, USDC · eth: ETH |
-| gas-price | `sol` / `bsc` / `base` / `eth` | — |
+| token / market / portfolio / track | `sol` / `bsc` / `base` / `eth` / `robinhood` | — |
+| swap / order | `sol` / `bsc` / `base` / `eth` / `robinhood` | sol: SOL, USDC · bsc: BNB, USDC · base: ETH, USDC · eth: ETH |
+| gas-price | `sol` / `bsc` / `base` / `eth` / `robinhood` | — |
+| track kol / track smartmoney · market signal | `sol` / `bsc` / `base` / `eth` (kol/smartmoney) · `sol` / `bsc` (signal) — **no `robinhood`** | — |
+| cooking create | `sol` / `bsc` / `base` — **no `robinhood`** | — |
 
 ---