feat: add Greenfield API endpoints for Tron USDt addresses - #33

Adds USDT on Polygon PoS as a second EVM chain alongside Ethereum,
reusing the existing EVM infrastructure (EthUSDtRPCProvider,
EthUSDtListener, EthUSDtLikeSummaryUpdaterHostedService) which
iterates EVMUSDtLikeConfigurationItems and handles all chains
automatically. No new hosted services are needed.

Changes:
- Add Constants.PolygonChainName and AmoyChainName
- Add BlockTimeSeconds to EthUSDtLikeConfigurationItem (ETH=12s, Polygon=2s)
  for correct sync threshold calculation
- Add ChainId to EthUSDtLikeConfigurationItem (ETH=1, Polygon=137)
  for correct EIP-681 QR code generation
- Rename EthereumUSDtLikeConfigurationItems to EVMUSDtLikeConfigurationItems
- Add GetPolygonUSDtHardcodedConfig with mainnet (chainId=137,
  contract=0xc2132d..., polygon-rpc.com, polygonscan.com) and Amoy testnet
- Add GetEVMUSDtDefaultConfigurationItem dispatcher by payment method ID
- Update UIEthUSDtLikeServerController to handle any EVM chain via
  {paymentMethodId} route param
- Add chain-specific store view GetStorePolygonUSDtLikePaymentMethod
- Wire Polygon in RegisterServices with its own payment handler,
  payment link extension, checkout model, and transaction link provider
- Add hidden DisplayName input in server config view to fix POST validation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

- TargetFramework: net8.0 → net10.0
- LangVersion: 12 → 13
- Npgsql.EntityFrameworkCore.PostgreSQL: 8.0.11 → 10.0.0
- global.json SDK: 8.0.404 → 10.0.100
- Minimum BTCPayServer version: >=2.0.0 → >=2.3.7 (first .NET 10 release)
- Replace HttpContext.GetStoreData() with GetStoreDataOrNull() per breaking change
- Update btcpayserver submodule to latest master

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Adds GET /api/v1/stores/{storeId}/evmUSDtlike/{paymentMethodId} to
retrieve store configuration with address balances and availability,
POST .../addresses to add an EVM address, and DELETE .../addresses/{address}
to remove one. Includes Swagger documentation for all three endpoints.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Adds POST /api/v1/stores/{storeId}/tronUSDtlike/{paymentMethodId}/addresses
to add a Tron address and DELETE .../addresses/{address} to remove one.
Includes Swagger documentation for both endpoints.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Both EVM and Tron add-address endpoints now accept a list of addresses
in a single request instead of one at a time. Invalid and duplicate
addresses are reported together in the error response.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…points

Inject StoreRepository and call UpdateStore after adding or removing
addresses so changes survive the request. Also fixes AddAddress to accept
an array of addresses matching the EVM endpoint behaviour.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>