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/internal/config/config.go

@@ -0,0 +1,24 @@
+package config
+
+import (
+	"github.com/zeromicro/go-zero/core/stores/redis"
+	"github.com/zeromicro/go-zero/rest"
+)
+
+type Config struct {
+	rest.RestConf
+	Steam SteamConfig
+	JWT   JWTConfig
+	Redis redis.RedisConf
+}
+
+type SteamConfig struct {
+	CallbackURL         string
+	FrontendCallbackURL string
+}
+
+type JWTConfig struct {
+	Secret    string
+	Issuer    string
+	ExpiresIn int64
+}