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>

skills/gmgn-portfolio/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: gmgn-portfolio
 description: Analyze any crypto wallet by address — holdings, realized/unrealized P&L, win rate, trading history, performance stats, specific token balance, and tokens created by a developer wallet (with ATH market cap and DEX graduation status) via GMGN API on Solana, BSC, Base, or Ethereum. Use when user asks about a wallet's holdings, P&L, win rate, what tokens a dev has launched, the highest ATH token a dev ever created, or wants a wallet report to decide whether to copy-trade or follow.
-argument-hint: "<info|holdings|activity|stats|token-balance|created-tokens> [--chain <sol|bsc|base|eth>] [--wallet <wallet_address>]"
+argument-hint: "<info|holdings|activity|stats|token-balance|created-tokens> [--chain <sol|bsc|base|eth|robinhood>] [--wallet <wallet_address>]"
 metadata:
   cliHelp: "gmgn-cli portfolio --help"
 ---
@@ -45,7 +45,7 @@ Use the `gmgn-cli` tool to query wallet portfolio data based on the user's reque
 
 ## Supported Chains
 
-`sol` / `bsc` / `base` / `eth`
+`sol` / `bsc` / `base` / `eth` / `robinhood`
 
 ## Prerequisites