feat: add FoR indexer and Sepolia deployment flow

[aowheel]

概要

• Router の TransferWithDistribution / DistributionRatioUpdated を index する packages/indexer を追加
• Router.sol に DistributionRatioUpdated emit を実装（setFundRatio / setBurnRatio）
• contract/indexer の Sepolia デプロイ手順を README で整備
• Sepolia へ Router をデプロイし、subgraph を Goldsky へデプロイして疎通確認済み

変更内容

• packages/indexer を新規追加
• schema.graphql に Transfer / User / DistributionRatio を追加
• src/mapping.ts に handleTransferWithDistribution / handleDistributionRatioUpdated を実装
• subgraph.template.yaml + config/sepolia.json / config/base.json で manifest 生成
• packages/contract/contracts/Router.sol に DistributionRatioUpdated イベント追加
• packages/contract/ignition/modules/Router.ts を現行 RouterFactory 引数に追従
• packages/contract/package.json に deploy:local:Router / deploy:sepolia:Router を追加
• packages/contract/README.md / packages/indexer/README.md を実運用フローに更新

動作確認

• pnpm --filter @for/indexer build:sepolia 成功
• pnpm --filter @for/indexer build:base 成功
• Goldsky endpoint 疎通確認
• Sepolia endpoint: https://api.goldsky.com/api/public/project_cm5nv64onnxxz01wf8smdgk1e/subgraphs/for-sepolia/0.0.0/gn

注意事項

• for-sepolia/0.0.0 は同名再デプロイ不可のため、運用時はバージョン命名ルールが必要
• packages/contract/ignition/deployments/* の生成物更新を含む

Closes #21
Closes #22
Closes #23
Closes #24
Closes #25

[Copilot]

Pull request overview

This PR adds a FoR indexer implementation using Goldsky and completes the Sepolia deployment flow for both contracts and the subgraph.

Changes:

• Added complete indexer package with GraphQL schema, subgraph manifest template, and event mapping handlers for TransferWithDistribution and DistributionRatioUpdated events
• Added DistributionRatioUpdated event emission to Router contract's setFundRatio and setBurnRatio functions
• Introduced FoRToken.sol with allowlist functionality and EIP712 signature support
• Updated Router and RouterFactory to accept initialAdmin parameter
• Added deployment configurations and scripts for Sepolia and Base networks
• Updated documentation with indexer setup instructions

Reviewed changes

Copilot reviewed 37 out of 41 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/indexer/*	New indexer package with schema, mappings, configs, and deployment scripts for Goldsky subgraph
packages/contract/contracts/Router.sol	Added DistributionRatioUpdated event and emissions in ratio setter functions
packages/contract/contracts/FoRToken.sol	New ERC20 token with permit, allowlist, and signature-based access control
packages/contract/ignition/modules/Router.ts	Updated to use FoRToken module and accept initialAdmin parameter
packages/contract/ignition/parameters.*.json	Added initialAdmin parameter to deployment configs
packages/contract/test/*	Formatting updates to align with code style
packages/contract/README.md	Updated with new deployment workflow and environment variable requirements
README.md	Added indexer section and updated commands
AGENTS.md	New file documenting repository guidelines
.vscode/*	Removed IDE-specific settings

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