feat: add skillshub web3 skills pack (39 skills)

[brief-onchain]

Summary

• Add 39 new skills under skills/binance-web3/
• Cover BSC market intelligence, BAP578 dev workflows, and ecosystem
  operation playbooks
• Keep scope limited to skill definition docs (SKILL.md) only

What’s Included

• Market & signals: top movers, funding watch, liquidation heatmap,
  open-interest scan, kline brief, crowding risk scan, etc.
• BAP578: adapter blueprint, contract idea sprint, deploy plan, test
  template, vault checklist
• Ecosystem intake: Four.meme workflows, ERC-8004 flows, prediction
  market, portfolio tracking, SyncX, and related playbooks

Quality Notes

• Added/normalized frontmatter metadata (name, description,
  metadata.author, metadata.version)
• Updated ambiguous local path references to clearer source anchors
  where needed
• No token secrets, private keys, binaries, or unrelated code changes

Validation

• Branch is mergeable against main
• Change set is additive and focused on new skill docs