docs(hedera-stats): Add documentation for NFT ranking and ERC-1155 adoption metrics

[omar-hgraph]

Overview

This PR adds comprehensive documentation for three new Hedera Stats metrics from merged PRs #69, #70, and #71. These metrics provide enhanced visibility into NFT ecosystem activity and smart contract adoption on Hedera.

Changes

1. NFT Collection Ranking Metrics (PRs #69 & #70)

• ERC-721 Smart Contract Rankings (top_non_fungible_tokens_erc)

  • Ranks ERC-721 NFT collections using composite scoring (60% volume + 40% transactions)
  • Min-max normalization for fair cross-collection comparison
  • Optional concentration filter to identify organic vs whale-dominated communities
  • Configurable time windows (24h, 72h, 168h, 720h)

• HTS Native NFT Rankings (top_non_fungible_tokens_hts)

  • Ranks native Hedera Token Service (NON_FUNGIBLE_UNIQUE) NFT collections
  • Same scoring methodology as ERC-721 with HTS-specific data handling
  • Multi-NFT transaction HBAR amount splitting
  • Treasury account exclusion for accurate volume tracking

2. ERC-1155 Multi-Token Adoption (PR #71)

• Total ERC-1155 Accounts (total_erc1155_accounts)
  • Tracks cumulative unique accounts holding ERC-1155 tokens
  • Monitors TransferSingle and TransferBatch contract events
  • Provides rolling totals across multiple granularities (hour, day, week, month, quarter, year)
  • Demonstrates adoption of the multi-token standard

3. Navigation & Discoverability

• Updated Hedera Stats introduction page with new metric links
• Organized metrics by category (Network Performance, EVM, NFTs)

Files Added

• docs/hedera-stats/non-fungible-tokens/top-erc-nfts.md
• docs/hedera-stats/non-fungible-tokens/top-hts-nfts.md
• docs/hedera-stats/evm/total-erc1155-accounts.md

Files Modified

• docs/hedera-stats/introduction.md

Verification

• All documentation builds without errors (npm run build)
• No broken internal links
• Content verified against actual SQL implementations in hedera-stats repository

Related Issues & PRs

• Implements documentation for PR [ENG-124] Top Non-Fungible Tokens (ERC) - Algorithmic Ranking Function hedera-stats#69
• Implements documentation for PR Add HTS NFT ranking function and metric description hedera-stats#70
• Implements documentation for PR Implement total ERC-1155 accounts metric with time-series tracking hedera-stats#71

Testing Instructions

1. Pull the branch: git checkout eng-435/update-stats-functionality
2. Install dependencies: npm install
3. Build documentation: npm run build
4. Serve locally: npm run serve
5. Verify all new pages render correctly under /hedera-stats/non-fungible-tokens/ and /hedera-stats/evm/

[linear]

ENG-435