refactor: rename remaining c4 references to games

Update binary name, DB path, session cookie, deploy scripts, systemd
service, Docker config, CI workflow, and .dockerignore. Remove stale
Claude command and settings files.

deploy/setup.sh

@@ -10,20 +10,20 @@ fi
 
 # Create system user if it doesn't exist
 if ! id -u games &>/dev/null; then
-  useradd --system --shell /usr/sbin/nologin --home-dir /opt/c4 --create-home games
+  useradd --system --shell /usr/sbin/nologin --home-dir /opt/games --create-home games
   echo "Created system user: games"
 else
   echo "User 'games' already exists"
 fi
 
 # Ensure install directory exists with correct ownership
-install -d -o games -g games -m 755 /opt/c4
-install -d -o games -g games -m 755 /opt/c4/data
+install -d -o games -g games -m 755 /opt/games
+install -d -o games -g games -m 755 /opt/games/data
 
 # Install systemd unit
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-cp "$SCRIPT_DIR/c4.service" /etc/systemd/system/c4.service
+cp "$SCRIPT_DIR/games.service" /etc/systemd/system/games.service
 systemctl daemon-reload
-systemctl enable c4.service
+systemctl enable games.service
 
 echo "Setup complete. Run deploy.sh to build and start the service."