feat: implement doctor schedule module, add detail fields to doctor profile, and integrate new appointment API client

appointment/Urls.java

@@ -0,0 +1,13 @@
+package vn.sis.appointment;
+
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+
+final class Urls {
+    private Urls() {
+    }
+
+    static String encodePathSegment(String value) {
+        return URLEncoder.encode(value, StandardCharsets.UTF_8).replace("+", "%20");
+    }
+}