Optimized Dockerfile: remove Electron, fix registry login

Dockerfile

@@ -2,39 +2,28 @@
 FROM node:20-alpine AS builder
 WORKDIR /app
 COPY package*.json ./
-RUN npm ci --omit=dev && npm ci
+RUN npm ci
 COPY tsconfig.server.json ./
 COPY src/server/ ./src/server/
 RUN npx tsc -p tsconfig.server.json
 
-# ── Production-Stage: Nur das Nötigste ─────────────────────────────
+# ── Production-Stage: Minimal, kein Electron ──────────────────────
 FROM node:20-alpine
 WORKDIR /app
 
-# Runtime-User (nicht root)
 RUN addgroup -S logviewer && adduser -S logviewer -G logviewer
 
-# Nur production dependencies
 COPY package*.json ./
-RUN npm ci --omit=dev && npm cache clean --force
+# Installiere OHNE Electron (wird für Server-Mode nicht gebraucht)
+RUN npm ci --omit=dev && npm uninstall electron && npm cache clean --force
 
-# Kompilierte Server-Dateien
 COPY --from=builder /app/dist-server/ ./dist-server/
-
-# Web-UI (statische Assets)
 COPY src/web/ ./src/web/
 
-# Persistenz-Volume
 RUN mkdir -p /app/collector-data /app/monitor-data && \
     chown -R logviewer:logviewer /app
 
-# Default-CMD (beide Modi aktiv)
 EXPOSE 8080
 ENV HOST=0.0.0.0 PORT=8080 LOG_MODE=both
 USER logviewer
 CMD ["node", "dist-server/server.js"]
-
-# Mögliche Overrides:
-# Collector:     -e LOG_MODE=collector -e COLLECTOR_UDP_PORT=5140
-# Viewer:        -e LOG_MODE=viewer -p 9090:9090
-# Monitor:       -e LOG_MODE=monitor -e MONITOR_RULES='[...]'