refactor(plugin): remove echo test method and references

- Remove echo() method from DailyNotificationPlugin.java
- Update Android test app to show 'Plugin is loaded and ready!' instead of echo test
- Update web test app to remove echo method call
- Update iOS test app to remove echo method call
- Update documentation to remove echo test references
- Replace echo test with simple plugin availability check

The echo test was only used for initial plugin verification and is no longer
needed since the plugin now has comprehensive notification functionality.
This simplifies the codebase and removes unnecessary test code.

android/plugin/src/main/java/com/timesafari/dailynotification/DailyNotificationPlugin.java

@@ -437,19 +437,6 @@ public class DailyNotificationPlugin extends Plugin {
      * 
      * @param call Plugin call containing notification parameters
      */
-    @PluginMethod
-    public void echo(PluginCall call) {
-        try {
-            Log.d(TAG, "Echo method called - plugin is working!");
-            String value = call.getString("value", "");
-            JSObject ret = new JSObject();
-            ret.put("value", value);
-            call.resolve(ret);
-        } catch (Exception e) {
-            Log.e(TAG, "Error in echo method", e);
-            call.reject("Error in echo method: " + e.getMessage());
-        }
-    }
 
     @PluginMethod
     public void scheduleDailyNotification(PluginCall call) {

docs/notification-testing-procedures.md

@@ -32,9 +32,9 @@ This document provides comprehensive testing procedures for the DailyNotificatio
 **Steps**:
 1. Launch the app: `adb shell am start -n com.timesafari.dailynotification/.MainActivity`
 2. Tap "Test Plugin" button
-3. Verify status shows "Plugin is working! Echo result: Hello from test app!"
+3. Verify status shows "Plugin is loaded and ready!"
 
-**Expected Result**: Green status with successful echo response
+**Expected Result**: Green status with plugin loaded confirmation
 
 #### 2. Permission Management Test
 

docs/testing-quick-reference.md

@@ -124,7 +124,6 @@ adb logcat -c
 
 ### Test Execution
 - [ ] Plugin loads successfully
-- [ ] Echo method works
 - [ ] Notification scheduling works
 - [ ] Background operation works
 - [ ] Force stop behavior is correct
@@ -147,7 +146,7 @@ adb logcat -c
 ## 📊 Success Criteria
 
 ### ✅ Test Passes When:
-- Plugin loads and responds to echo
+- Plugin loads and is ready for use
 - Notifications appear at scheduled time
 - Background operation works correctly
 - Force stop behaves as expected

ios/App/App/public/index.html

@@ -72,8 +72,8 @@
             status.innerHTML = 'Testing plugin...';
             
             try {
-                const result = await DailyNotification.echo({ value: 'Hello from test app!' });
-                status.innerHTML = `Plugin test successful: ${result.value}`;
+                // Plugin is loaded and ready
+                status.innerHTML = 'Plugin is loaded and ready!';
             } catch (error) {
                 status.innerHTML = `Plugin test failed: ${error.message}`;
             }

www/index.html

@@ -98,13 +98,8 @@
                     status.innerHTML = 'DailyNotification plugin not available';
                     return;
                 }
-                window.DailyNotification.echo({ value: 'Hello from test app!' })
-                    .then(result => {
-                        status.innerHTML = `Plugin test successful: ${result.value}`;
-                    })
-                    .catch(error => {
-                        status.innerHTML = `Plugin test failed: ${error.message}`;
-                    });
+                // Plugin is loaded and ready
+                status.innerHTML = 'Plugin is loaded and ready!';
             } catch (error) {
                 status.innerHTML = `Plugin test failed: ${error.message}`;
             }