update Dockerfile to use python:3.13-slim-trixie base image

Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1
-FROM python:3.13-slim-bookworm AS builder
+FROM python:3.13-slim-trixie AS builder
 
 ARG SCALABLE_CLI_VERSION=1.0.0
 ARG TARGETARCH
@@ -22,23 +22,19 @@ RUN ARCH=$([ "$TARGETARCH" = "arm64" ] && echo "aarch64" || echo "x86_64") \
     && mv sc-v${SCALABLE_CLI_VERSION}-linux-${ARCH}-gnu/sc /usr/local/bin/sc \
     && chmod +x /usr/local/bin/sc
 
-FROM python:3.13-slim-bookworm
+FROM python:3.13-slim-trixie
 
 ARG PUID=1000
 ARG PGID=1000
 
-# 1. System-Pakete (inkl. gosu)
 RUN apt-get update && apt-get install -y --no-install-recommends gosu \
     && rm -rf /var/lib/apt/lists/*
 
-# 2. User anlegen
 RUN groupadd -g ${PGID} appgroup \
     && useradd -u ${PUID} -g appgroup -m -d /home/appuser appuser
 
-# 3. Scalable CLI kopieren
 COPY --from=builder /usr/local/bin/sc /usr/local/bin/sc
 
-# 4. App-Dateien
 WORKDIR /app
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
@@ -46,10 +42,8 @@ COPY scalable_sync.py .
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
-# 5. Env
 ENV SC_CONFIG_DIR=/tmp/sc-config
 ENV PUID=${PUID}
 ENV PGID=${PGID}
 
-# 6. Entrypoint (wechselt intern auf appuser)
 ENTRYPOINT ["/entrypoint.sh"]