feat: Implement Steam login initialization logic

- Added SteamLoginInitLogic to handle the initiation of Steam login.
- Created service context for managing configuration and Redis connection.
- Defined types for Steam login requests and callbacks.
- Implemented utility functions for building OpenID query strings and validating responses from Steam.
- Updated go.mod and go.sum to include necessary dependencies.
- Modified GenApi.ps1 script to generate code in the correct directory.

script/goctl/GenApi.ps1

@@ -17,7 +17,7 @@ Set-Location -Path (Resolve-Path "../../api")
 goctl api format -dir .
 
 # generate go-zero code
-goctl api go -api Authenticator.api -dir ../src  --style=gozero
+goctl api go -api Authenticator.api -dir ../app  --style=gozero
 
 # generate swagger and convert to openapi3 only when -s is provided
 if ($s) {