fix(frontend): projet Android complet (embedding v2) pour build web Docker

- Régénération android/ (MainActivity, Gradle, manifestes, icônes)
- gradle-wrapper.jar versionné (wrapper requis hors machine locale)
- Ignore local.properties à la racine du dépôt
- pubspec.lock / .metadata alignés Flutter 3.19 (résolution pub get CI)

Made-with: Cursor

frontend/.metadata

@@ -4,8 +4,8 @@
 # This file should be version controlled and should not be manually edited.
 
 version:
-  revision: "ea121f8859e4b13e47a8f845e4586164519588bc"
-  channel: "stable"
+  revision: "bae5e49bc2a867403c43b2aae2de8f8c33b037e4"
+  channel: "[user-branch]"
 
 project_type: app
 
@@ -13,14 +13,11 @@ project_type: app
 migration:
   platforms:
     - platform: root
-      create_revision: ea121f8859e4b13e47a8f845e4586164519588bc
-      base_revision: ea121f8859e4b13e47a8f845e4586164519588bc
-    - platform: web
-      create_revision: ea121f8859e4b13e47a8f845e4586164519588bc
-      base_revision: ea121f8859e4b13e47a8f845e4586164519588bc
-    - platform: windows
-      create_revision: ea121f8859e4b13e47a8f845e4586164519588bc
-      base_revision: ea121f8859e4b13e47a8f845e4586164519588bc
+      create_revision: bae5e49bc2a867403c43b2aae2de8f8c33b037e4
+      base_revision: bae5e49bc2a867403c43b2aae2de8f8c33b037e4
+    - platform: android
+      create_revision: bae5e49bc2a867403c43b2aae2de8f8c33b037e4
+      base_revision: bae5e49bc2a867403c43b2aae2de8f8c33b037e4
 
   # User provided section