Add Android background geolocation with notification error handling

Add flutter_background_geolocation for background location tracking on Android.
Service automatically sends coordinates to server when app is in background.
Error messages are shown as system notifications using flutter_local_notifications.

pubspec.lock

@@ -17,6 +17,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.13.1"
+  background_fetch:
+    dependency: transitive
+    description:
+      name: background_fetch
+      sha256: a185b471f6ff93c0074e2da98fbdf1e0c5af5a83adb97dfe924a9ef06c9e0175
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.7.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -49,16 +57,8 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.19.1"
-  convert:
-    dependency: "direct main"
-    description:
-      name: convert
-      sha256: b30acd5944035672bc15c6b7a8b47d773e41e2f17de064350988c5d02adb1c68
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.1.2"
   crypto:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: crypto
       sha256: c8ea0233063ba03258fbcf2ca4d6dadfefe14f02fab57702265467a19f27fadf
@@ -118,6 +118,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_background_geolocation:
+    dependency: "direct main"
+    description:
+      name: flutter_background_geolocation
+      sha256: "2c5f23bf35837b31c4e1badadf7fb5da418a1862133b5a671b3e0bfa60c3bf2f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.18.3"
   flutter_lints:
     dependency: "direct dev"
     description:
@@ -126,6 +134,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.0.0"
+  flutter_local_notifications:
+    dependency: "direct main"
+    description:
+      name: flutter_local_notifications
+      sha256: ef41ae901e7529e52934feba19ed82827b11baa67336829564aeab3129460610
+      url: "https://pub.dev"
+    source: hosted
+    version: "18.0.1"
+  flutter_local_notifications_linux:
+    dependency: transitive
+    description:
+      name: flutter_local_notifications_linux
+      sha256: "8f685642876742c941b29c32030f6f4f6dacd0e4eaecb3efbb187d6a3812ca01"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.0.0"
+  flutter_local_notifications_platform_interface:
+    dependency: transitive
+    description:
+      name: flutter_local_notifications_platform_interface
+      sha256: "6c5b83c86bf819cdb177a9247a3722067dd8cc6313827ce7c77a4b238a26fd52"
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.0.0"
   flutter_localizations:
     dependency: "direct main"
     description: flutter
@@ -546,6 +578,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.7.7"
+  timezone:
+    dependency: transitive
+    description:
+      name: timezone
+      sha256: dd14a3b83cfd7cb19e7888f1cbc20f258b8d71b54c06f79ac585f14093a287d1
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.10.1"
   typed_data:
     dependency: transitive
     description:
@@ -628,4 +668,4 @@ packages:
     version: "6.6.1"
 sdks:
   dart: ">=3.10.1 <4.0.0"
-  flutter: ">=3.35.0"
+  flutter: ">=3.38.0"