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.

app/etc/authenticator.yaml

@@ -0,0 +1,17 @@
+Name: Authenticator
+Host: 0.0.0.0
+Port: 8888
+
+Steam:
+  CallbackURL: https://www.cialloo.com/api/authenticator/steam/callback
+  FrontendCallbackURL: https://www.cialloo.com/auth/callback
+
+JWT:
+  Secret: your-secret-key-change-in-production
+  Issuer: cialloo-authenticator
+  ExpiresIn: 604800  # 7 days in seconds
+
+Redis:
+  Host: redis.production.svc.cluster.local:6379
+  Type: node
+  Pass: ""