refactor: rename Hermes API to Admin API v2 under /api/v2

Integrates the external API into the existing /api group as v2 with
API key auth (ADMIN_API_KEY), replacing the separate /hermes namespace.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

rest/middlewares/auth.go

@@ -262,8 +262,8 @@ func AuthAdmin(c *fiber.Ctx) error {
 
 func AuthApi() func(*fiber.Ctx) error {
 	return func(c *fiber.Ctx) error {
-		// Excluir rutas públicas
-		if c.Path() == "/api/v1/oauth/token" || c.Path() == "/api/sms/send" {
+		// Excluir rutas públicas y /api/v2 (tiene su propio middleware)
+		if c.Path() == "/api/v1/oauth/token" || c.Path() == "/api/sms/send" || strings.HasPrefix(c.Path(), "/api/v2") {
 			return c.Next()
 		}