Add phase 6: backup/restore scripts and full README

- backup.sh: pg_dump (custom format), media volume and .env in one
  archive with retention (KEEP), cron example
- restore.sh: confirmation, restores .env if missing, pg_restore
  --clean in one transaction, replaces media, restarts the app
- Fix: MEDIA_ROOT=/data/media in the image so photos land on the volume
- README: installation, Nginx/Cloudflare client-IP setup, configuration
  table, AI and Instagram notes, update, backup, troubleshooting, security
- Test settings independent of the local .env

Co-Authored-By: Claude Opus 5.5 <[email protected]>

Dockerfile

@@ -3,7 +3,8 @@ FROM python:3.12-slim AS base
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
     PIP_NO_CACHE_DIR=1 \
-    PIP_DISABLE_PIP_VERSION_CHECK=1
+    PIP_DISABLE_PIP_VERSION_CHECK=1 \
+    MEDIA_ROOT=/data/media
 
 RUN groupadd --system --gid 1000 app \
     && useradd --system --uid 1000 --gid app --home /app app
@@ -30,6 +31,6 @@ COPY requirements-dev.txt .
 RUN pip install -r requirements-dev.txt
 USER app
 ENTRYPOINT []
-CMD ["pytest"]
+CMD ["pytest", "-p", "no:cacheprovider"]
 
 FROM base AS production