Refactor WiFiManager: extract server and handlers into separate modules

- Move server lifecycle management to WiFiManagerServer
- Move HTTP handlers and rendering to WiFiManagerHandlers
- Move DEBUG_WM template definitions to WiFiManagerDebug
- Implement lazy initialization of server manager to save memory
- Add proper cleanup in destructor and on multiple createServer calls
- Update tests to use getServer() and getDNSServer() accessors

test/test_wifimanager/tests/test_dns_lifecycle.cpp

@@ -15,13 +15,13 @@ void test_dns_server_created() {
     
     // Wait for DNS server to be created
     unsigned long start = millis();
-    while (!wm.dnsServer && (millis() - start < 1000)) {
+    while (!wm.getDNSServer() && (millis() - start < 1000)) {
         wm.process();
         delay(10);
     }
     
     // DNS server should be created when portal starts
-    TEST_ASSERT_NOT_NULL(wm.dnsServer);
+    TEST_ASSERT_NOT_NULL(wm.getDNSServer());
     
     wm.stopConfigPortal();
     
@@ -40,13 +40,13 @@ void test_dns_server_cleanup() {
     
     // Wait for DNS server to be created
     unsigned long start = millis();
-    while (!wm.dnsServer && (millis() - start < 1000)) {
+    while (!wm.getDNSServer() && (millis() - start < 1000)) {
         wm.process();
         delay(10);
     }
     
     // Verify DNS server exists
-    TEST_ASSERT_NOT_NULL(wm.dnsServer);
+    TEST_ASSERT_NOT_NULL(wm.getDNSServer());
     
     // Stop portal
     wm.stopConfigPortal();
@@ -72,11 +72,11 @@ void test_dns_server_lifecycle_cycles() {
     wm.process();
     
     unsigned long start = millis();
-    while (!wm.dnsServer && (millis() - start < 1000)) {
+    while (!wm.getDNSServer() && (millis() - start < 1000)) {
         wm.process();
         delay(10);
     }
-    TEST_ASSERT_NOT_NULL(wm.dnsServer);
+    TEST_ASSERT_NOT_NULL(wm.getDNSServer());
     
     wm.stopConfigPortal();
     wm.process();
@@ -87,11 +87,11 @@ void test_dns_server_lifecycle_cycles() {
     wm.process();
     
     start = millis();
-    while (!wm.dnsServer && (millis() - start < 1000)) {
+    while (!wm.getDNSServer() && (millis() - start < 1000)) {
         wm.process();
         delay(10);
     }
-    TEST_ASSERT_NOT_NULL(wm.dnsServer);
+    TEST_ASSERT_NOT_NULL(wm.getDNSServer());
     
     wm.stopConfigPortal();
     wm.process();

test/test_wifimanager/tests/test_integration.cpp

@@ -1,6 +1,7 @@
 #include <unity.h>
 #include <Arduino.h>
 #include <WiFiManager.h>
+#include <WiFiManagerParameter.h>
 #include "../test_main.h"
 
 // Test autoConnect fallback flow
@@ -145,8 +146,8 @@ void test_portal_with_parameters_and_infrastructure() {
     TEST_ASSERT_TRUE(wm.getConfigPortalActive());
     
     // Verify infrastructure
-    TEST_ASSERT_NOT_NULL(wm.server);
-    TEST_ASSERT_NOT_NULL(wm.dnsServer);
+    TEST_ASSERT_NOT_NULL(wm.getServer());
+    TEST_ASSERT_NOT_NULL(wm.getDNSServer());
     
     // Verify parameters
     TEST_ASSERT_EQUAL(2, wm.getParametersCount());

test/test_wifimanager/tests/test_parameter_values.cpp

@@ -1,6 +1,7 @@
 #include <unity.h>
 #include <Arduino.h>
 #include <WiFiManager.h>
+#include <WiFiManagerParameter.h>
 #include "../test_main.h"
 
 // Test parameter value set directly

test/test_wifimanager/tests/test_parameters.cpp

@@ -1,6 +1,7 @@
 #include <unity.h>
 #include <Arduino.h>
 #include <WiFiManager.h>
+#include <WiFiManagerParameter.h>
 
 // Test custom parameters
 void test_create_parameter() {

test/test_wifimanager/tests/test_portal_lifecycle.cpp

@@ -107,10 +107,10 @@ void test_config_portal_infrastructure() {
     delay(200); // Give time for initialization
     
     // Verify server object exists (must check while portal is active)
-    TEST_ASSERT_NOT_NULL_MESSAGE(wm.server, "Server object should exist when portal is active");
+    TEST_ASSERT_NOT_NULL_MESSAGE(wm.getServer(), "Server object should exist when portal is active");
     
     // Verify DNS server exists
-    TEST_ASSERT_NOT_NULL_MESSAGE(wm.dnsServer, "DNS server object should exist when portal is active");
+    TEST_ASSERT_NOT_NULL_MESSAGE(wm.getDNSServer(), "DNS server object should exist when portal is active");
     
     // Verify WiFi is in AP mode
     WiFiMode_t mode = WiFi.getMode();
@@ -145,7 +145,7 @@ void test_start_web_portal() {
     wm.process();
     
     // Verify server object exists
-    TEST_ASSERT_NOT_NULL(wm.server);
+    TEST_ASSERT_NOT_NULL(wm.getServer());
     
     wm.stopWebPortal();
     

test/test_wifimanager/tests/test_state_transitions.cpp

@@ -76,8 +76,8 @@ void test_state_consistency_during_portal() {
     
     // Verify state consistency
     TEST_ASSERT_TRUE(wm.getConfigPortalActive());
-    TEST_ASSERT_NOT_NULL(wm.server);
-    TEST_ASSERT_NOT_NULL(wm.dnsServer);
+    TEST_ASSERT_NOT_NULL(wm.getServer());
+    TEST_ASSERT_NOT_NULL(wm.getDNSServer());
     
     // Process multiple times
     for (int i = 0; i < 10; i++) {

test/test_wifimanager/tests/test_stress.cpp

@@ -1,6 +1,7 @@
 #include <unity.h>
 #include <Arduino.h>
 #include <WiFiManager.h>
+#include <WiFiManagerParameter.h>
 #include "../test_main.h"
 
 // Test many start/stop cycles for memory leaks
@@ -56,8 +57,8 @@ void test_long_running_portal() {
         TEST_ASSERT_TRUE(wm.getConfigPortalActive());
         
         // Verify infrastructure remains
-        TEST_ASSERT_NOT_NULL(wm.server);
-        TEST_ASSERT_NOT_NULL(wm.dnsServer);
+        TEST_ASSERT_NOT_NULL(wm.getServer());
+        TEST_ASSERT_NOT_NULL(wm.getDNSServer());
         
         delay(10);
     }