Fix ffpyplayer offline wheel and update install scripts

- Rebuilt evdev wheel for cp313 aarch64 (was missing from repo)
- Updated install.sh: add --system-site-packages to venv, verify imports
- Updated start.sh: activate .venv before running player
- Updated run_player.sh: activate .venv before running player
- Added pip fallback for kivy/ffpyplayer if apt/pip install misses them

start.sh

@@ -237,9 +237,15 @@ while true; do
     # Clean old heartbeat
     rm -f "$HEARTBEAT_FILE"
     
+    # Activate virtual environment if it exists
+    if [ -f "$SCRIPT_DIR/.venv/bin/activate" ]; then
+        source "$SCRIPT_DIR/.venv/bin/activate"
+    fi
+    
     # Start the player
     cd "$SCRIPT_DIR/src"
     python3 main.py &
+    PLAYER_PID=$!
     
     log_message "Player PID: $PLAYER_PID"