[PLA-2417] Update to SDK v3

[JayPavlina]

• rewrites server to use .Net and use v3 of C# sdk
• has been tested with the unity and godot clients

Additional Info

This pull request introduces a new C# web API server for the Enjin platform sample game, replacing the previous Node.js implementation. The new server is structured with modern .NET practices and provides endpoints for authentication, wallet management, token operations, and setup. It also introduces a new DTO model layer and configuration via appsettings/environment variables. The most important changes are summarized below:

API Endpoint Implementation

• Added new endpoint groups for authentication (AuthEndpoints), wallet management (WalletEndpoints), token operations (TokenEndpoints), and setup (SetupEndpoints). These endpoints follow RESTful conventions and match the expected shapes for the Unity client, supporting features like user registration/login, wallet querying, token mint/melt/transfer, and collection ID retrieval. [1] [2] [3] [4]

Data Transfer Objects (DTOs) and Models

• Introduced a comprehensive set of request and response DTOs in Dtos.cs, ensuring wire compatibility with the Unity client and encapsulating all API request/response shapes. Also added an in-memory User model for authentication. [1] [2]

Server Configuration and Bootstrap

• Replaced the .env.example with strongly-typed configuration using appsettings and environment variables, and removed the old environment variable file. The server now bootstraps the Enjin collection at startup and supports skipping bootstrap for local testing. [1] [2]

Project Structure and Dependencies

• Added a new .NET project file (PlatformSampleGameServer.csproj) targeting .NET 9, with dependencies for JWT authentication, cryptography, and the Enjin Platform SDK.

Authentication and Security

• Implemented JWT-based authentication and authorization, with secure defaults and automatic dev secret generation if not configured. Endpoints are protected as appropriate, with setup endpoints intentionally left unauthenticated for initial provisioning. [1] [2] [3]

These changes lay the foundation for a robust, modern, and maintainable sample game server for Enjin platform integration.

[Copilot]

Pull request overview

This PR replaces the previous Node.js Express sample server with a new .NET 9 (C#) minimal-API server that integrates with Enjin Platform SDK v3 while preserving the Unity client’s expected HTTP routes and JSON shapes.

Changes:

• Introduces a new .NET 9 web API project with minimal API endpoint groups for auth, wallet, token operations, and setup.
• Adds a C# service layer for Enjin Platform v3 interactions (collection bootstrap, managed wallets, mint/melt/transfer, transaction polling, ENJ drip) plus SS58 address encoding.
• Removes the legacy Node.js implementation and its npm dependencies; moves configuration to appsettings*.json + environment variables.

Reviewed changes

Copilot reviewed 28 out of 30 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
tools/Ss58SelfTest/Ss58SelfTest.csproj	Adds a small console tool project referencing the server for SS58 encoding verification.
tools/Ss58SelfTest/Program.cs	Runs a simple SS58 encode example for manual validation.
src/services/enjinService.js	Removes old Node.js Enjin platform integration service.
src/services/authService.js	Removes old Node.js auth service (bcrypt/jwt).
src/routes/wallet.js	Removes old Node.js wallet routes.
src/routes/token.js	Removes old Node.js token routes.
src/routes/auth.js	Removes old Node.js auth routes.
src/models/user.js	Removes old in-memory user model.
src/middlewares/jwtAuth.js	Removes old JWT middleware.
src/index.js	Removes old Node.js server bootstrap.
Services/UserStore.cs	Adds in-memory, process-local user registry for the C# server.
Services/SubstrateAddress.cs	Adds SS58 encoding utility to convert platform public keys to SS58 addresses.
Services/Options.cs	Adds strongly typed configuration options for Enjin/JWT/Server settings.
Services/EnjinService.cs	Implements all Enjin Platform SDK v3 interactions + persisted bootstrap state.
Services/AuthService.cs	Implements bcrypt password hashing + JWT issuance for Unity client auth.
README.md	Updates documentation to reflect the new .NET server and setup flow.
Program.cs	Adds .NET host configuration, DI, auth, routing, and bootstrap orchestration.
PlatformSampleGameServer.csproj	Adds new .NET 9 web project and NuGet dependencies (JWT, bcrypt, Enjin SDK, blake2).
package.json	Removes Node.js package manifest.
package-lock.json	Removes Node.js lockfile.
Models/User.cs	Adds C# user record for in-memory auth store.
Models/Dtos.cs	Adds DTOs matching Unity client wire format.
Endpoints/WalletEndpoints.cs	Adds JWT-protected wallet endpoints (get managed wallet tokens).
Endpoints/TokenEndpoints.cs	Adds JWT-protected token endpoints (mint/melt/transfer).
Endpoints/SetupEndpoints.cs	Adds unauthenticated setup endpoint(s) for Unity editor tooling.
Endpoints/AuthEndpoints.cs	Adds auth endpoints (health-check, register-or-login).
appsettings.Sample.json	Adds sample configuration template for local setup.
appsettings.json	Adds default config for logging/server/jwt/enjin/resource tokens.
.gitignore	Updates ignored files for .NET build artifacts and local config/state.
.env.example	Removes Node.js .env template.

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[Copilot]

Pull request overview

Copilot reviewed 28 out of 30 changed files in this pull request and generated 8 comments.

[JayPavlina]

CI will fail until the C# SDK is published to Nuget