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

appointment/FormData.java

@@ -0,0 +1,41 @@
+package vn.sis.appointment;
+
+import com.sun.net.httpserver.HttpExchange;
+
+import java.io.IOException;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+final class FormData {
+    private static final int MAX_REQUEST_BYTES = 256 * 1024;
+
+    private FormData() {
+    }
+
+    static Map<String, String> read(HttpExchange exchange) throws IOException {
+        byte[] data = exchange.getRequestBody().readNBytes(MAX_REQUEST_BYTES + 1);
+        if (data.length > MAX_REQUEST_BYTES) {
+            throw new IllegalArgumentException("Du lieu gui len vuot qua gioi han 256 KB.");
+        }
+
+        String body = new String(data, StandardCharsets.UTF_8);
+        Map<String, String> result = new LinkedHashMap<>();
+        if (body.isBlank()) {
+            return result;
+        }
+
+        for (String pair : body.split("&")) {
+            int separator = pair.indexOf('=');
+            String rawKey = separator >= 0 ? pair.substring(0, separator) : pair;
+            String rawValue = separator >= 0 ? pair.substring(separator + 1) : "";
+            result.put(decode(rawKey), decode(rawValue));
+        }
+        return result;
+    }
+
+    private static String decode(String value) {
+        return URLDecoder.decode(value, StandardCharsets.UTF_8);
+    }
+}