Initialize CMS application scaffold

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

internal/web/mapping/auth.go

@@ -0,0 +1,15 @@
+package mapping
+
+import "github.com/example/cms/internal/identity"
+
+type LoginRequest struct{ Subject, Email, Name string }
+
+func (r LoginRequest) Identity() identity.Identity {
+	return identity.Identity{Subject: r.Subject, Email: r.Email, Name: r.Name}
+}
+
+type LoginResponse struct {
+	Token string `json:"token"`
+	User  any    `json:"user,omitempty"`
+	Admin any    `json:"admin,omitempty"`
+}