fix: run Happy daemon as app user, not root

When init-repo.sh starts the happy daemon as root, HOME=/root so
Happy and Claude Code can't find credentials stored in /home/user.
The mobile app works when the user manually runs happy from a VSCode
terminal (as the user user) because the right home dir is in scope.

Use sudo -u with -E (preserve environment) so the daemon runs as the
correct user while still inheriting the pod's env vars (HAPPY_SERVER_URL,
HAPPY_WEBAPP_URL, ANTHROPIC_API_KEY, etc.).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/init-repo.sh

@@ -59,11 +59,13 @@ chown -R "$RUN_UID:$RUN_GID" "$WORKSPACE_DIR"
 mkdir -p "$HOME"
 chown "$RUN_UID:$RUN_GID" "$HOME"
 
-# Start Happy Coder daemon
+# Start Happy Coder daemon as the app user so it can access user credentials
+# (running as root means HOME=/root, Claude Code and Happy config would be missing)
 echo "Starting Happy Coder..."
-cd "$WORKSPACE_DIR"
 
-happy daemon start || echo "Happy Coder daemon failed to start, continuing anyway..."
+RUN_USER=$(id -nu "$RUN_UID" 2>/dev/null || echo "user")
+sudo -u "$RUN_USER" -E sh -c "cd '$WORKSPACE_DIR' && happy daemon start" \
+    || echo "Happy Coder daemon failed to start, continuing anyway..."
 
 echo "Happy Coder daemon started"