feat: update Flutter version to 3.41.2 and remove FVM activation from Dockerfile

flutter-android/Dockerfile

@@ -3,7 +3,7 @@ FROM debian:12-slim
 ENV DEBIAN_FRONTEND=noninteractive
 
 # ===== ВЕРСИИ (фиксируем для стабильности CI) =====
-ENV FLUTTER_VERSION=3.19.6
+ENV FLUTTER_VERSION=3.41.2
 ENV ANDROID_API=34
 ENV ANDROID_BUILD_TOOLS=34.0.0
 ENV ANDROID_CMDLINE_TOOLS=11076708
@@ -66,10 +66,6 @@ RUN git clone https://github.com/flutter/flutter.git \
     --depth 1 \
     ${FLUTTER_HOME}
 
-RUN flutter pub global activate fvm \
-    && fvm install 3.41.0 \
-    && fvm use 3.41.0 --force
-
 # Precache только Android (без web, linux, macOS)
 RUN flutter precache --android