v7.4: fetch all landmarks + cleanup after upload

- Updated version to 1.7.4 (versionCode 10)
- Modified BeeApiClient.getLandmarks() to fetch 50,000 landmarks instead of 200
- Added cleanupLandmarks() method to attempt deletion from Bee device after upload
- Enhanced AdaMapsUploadWorker to call cleanup after successful upload to ADAMaps
- Cleanup tries multiple potential DELETE endpoints and cmd interface
- Documents limitation: Bee API may not support landmark deletion

Note: Cleanup functionality is exploratory - no confirmed DELETE endpoint found in Bee API docs

app/build.gradle.kts

@@ -13,8 +13,8 @@ android {
         applicationId = "com.adamaps.varroa"
         minSdk = 26
         targetSdk = 34
-        versionCode = 9
-        versionName = "1.7.3"
+        versionCode = 10
+        versionName = "1.7.4"
 
         vectorDrawables {
             useSupportLibrary = true