chore: auto-commit (23 archivos)

- app.md
- backend/auth.go
- backend/db.go
- backend/dist/assets/index-CPqSy0gZ.js
- backend/dist/index.html
- backend/handlers.go
- backend/main.go
- frontend/src/App.tsx
- frontend/src/api.ts
- frontend/src/components/KanbanCard.tsx
- ...

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/auth.go

@@ -30,8 +30,12 @@ func tokenFromRequest(r *http.Request) string {
 }
 
 // POST /api/auth/register {username, password, display_name?}
-func handleRegister(db *DB) http.HandlerFunc {
+func handleRegister(db *DB, flags *FeatureFlags) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		if !flags.Enabled("registration-enabled") {
+			infra.HTTPErrorResponse(w, infra.HTTPError{Status: http.StatusForbidden, Code: "registration_disabled", Message: "user registration is disabled on this instance"})
+			return
+		}
 		var body struct {
 			Username    string `json:"username"`
 			Password    string `json:"password"`