feat: basic auth shit + db init

internal/api/routes/auth.go

@@ -0,0 +1,28 @@
+package routes
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"stereo.cat/backend/internal/types"
+)
+
+func RegisterAuthRoutes(cfg *types.StereoConfig, api *gin.RouterGroup) {
+	api.GET("/auth/callback", func(c *gin.Context) {
+		code := c.Query("code")
+
+		t, err := cfg.Client.ExchangeCode(code)
+
+		if err != nil {
+			panic(err)
+		}
+
+		user, err := cfg.Client.GetUser(t)
+
+		if err != nil {
+			panic(err)
+		}
+
+		c.JSON(http.StatusOK, user)
+	})
+}