⚡ add middleware for authentication and captcha, implement initial API routes for user, post, label, and page

internal/middleware/auth.go

@@ -0,0 +1,12 @@
+package middleware
+
+import (
+	"context"
+	"github.com/cloudwego/hertz/pkg/app"
+)
+
+func UseAuth() app.HandlerFunc {
+	return func(ctx context.Context, c *app.RequestContext) {
+		// TODO: Implement authentication logic here
+	}
+}