fix: set TZ=Europe/Bucharest in Docker + scheduler diagnostic logs

The container was running on UTC by default — the 1-5 AM window was
actually 4-8 AM Romania time, missing the intended night window.

- Add TZ=Europe/Bucharest + tzdata package to Dockerfile
- Add startup diagnostic logs: server time, timezone, ETERRA creds check

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -37,9 +37,10 @@ FROM node:22-alpine AS runner
 WORKDIR /app
 
 ENV NODE_ENV=production
+ENV TZ=Europe/Bucharest
 
 # Install system deps + create user in a single layer
-RUN apk add --no-cache gdal gdal-tools ghostscript qpdf \
+RUN apk add --no-cache gdal gdal-tools ghostscript qpdf tzdata \
     && addgroup --system --gid 1001 nodejs \
     && adduser --system --uid 1001 nextjs