chore: auto-commit (23 archivos)

- app.md
- backend/dist/assets/index-CFDWXN9Z.js
- backend/dist/index.html
- backend/handlers.go
- backend/main.go
- backend/users.go
- e2e/smoke_live.sh
- frontend/src/App.tsx
- frontend/src/api.ts
- frontend/src/components/CardChatPanel.tsx
- ...

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

backend/users.go

@@ -14,6 +14,7 @@ type User struct {
 	Username    string `json:"username"`
 	DisplayName string `json:"display_name"`
 	Color       string `json:"color"`
+	IsAdmin     bool   `json:"is_admin"`
 	CreatedAt   string `json:"created_at"`
 }
 
@@ -51,36 +52,52 @@ func (db *DB) CreateUser(username, password, displayName string) (*User, error)
 
 func (db *DB) GetUserByID(id string) (*User, error) {
 	var u User
+	var isAdmin int
 	err := db.conn.QueryRow(
-		`SELECT id, username, display_name, color, created_at FROM users WHERE id=?`, id,
-	).Scan(&u.ID, &u.Username, &u.DisplayName, &u.Color, &u.CreatedAt)
+		`SELECT id, username, display_name, color, is_admin, created_at FROM users WHERE id=?`, id,
+	).Scan(&u.ID, &u.Username, &u.DisplayName, &u.Color, &isAdmin, &u.CreatedAt)
 	if errors.Is(err, sql.ErrNoRows) {
 		return nil, errUserNotFound
 	}
 	if err != nil {
 		return nil, err
 	}
+	u.IsAdmin = isAdmin == 1
 	return &u, nil
 }
 
+func (db *DB) IsAdmin(userID string) (bool, error) {
+	if userID == "" {
+		return false, nil
+	}
+	var n int
+	err := db.conn.QueryRow(`SELECT COALESCE(is_admin, 0) FROM users WHERE id=?`, userID).Scan(&n)
+	if errors.Is(err, sql.ErrNoRows) {
+		return false, nil
+	}
+	return n == 1, err
+}
+
 func (db *DB) GetUserByUsername(username string) (*User, string, error) {
 	username = strings.TrimSpace(strings.ToLower(username))
 	var u User
 	var hash string
+	var isAdmin int
 	err := db.conn.QueryRow(
-		`SELECT id, username, display_name, color, created_at, password_hash FROM users WHERE username=?`, username,
-	).Scan(&u.ID, &u.Username, &u.DisplayName, &u.Color, &u.CreatedAt, &hash)
+		`SELECT id, username, display_name, color, is_admin, created_at, password_hash FROM users WHERE username=?`, username,
+	).Scan(&u.ID, &u.Username, &u.DisplayName, &u.Color, &isAdmin, &u.CreatedAt, &hash)
 	if errors.Is(err, sql.ErrNoRows) {
 		return nil, "", errUserNotFound
 	}
 	if err != nil {
 		return nil, "", err
 	}
+	u.IsAdmin = isAdmin == 1
 	return &u, hash, nil
 }
 
 func (db *DB) ListUsers() ([]User, error) {
-	rows, err := db.conn.Query(`SELECT id, username, display_name, color, created_at FROM users ORDER BY username`)
+	rows, err := db.conn.Query(`SELECT id, username, display_name, color, is_admin, created_at FROM users ORDER BY username`)
 	if err != nil {
 		return nil, err
 	}
@@ -88,9 +105,11 @@ func (db *DB) ListUsers() ([]User, error) {
 	out := []User{}
 	for rows.Next() {
 		var u User
-		if err := rows.Scan(&u.ID, &u.Username, &u.DisplayName, &u.Color, &u.CreatedAt); err != nil {
+		var isAdmin int
+		if err := rows.Scan(&u.ID, &u.Username, &u.DisplayName, &u.Color, &isAdmin, &u.CreatedAt); err != nil {
 			return nil, err
 		}
+		u.IsAdmin = isAdmin == 1
 		out = append(out, u)
 	}
 	return out, rows.Err()