feat: web UI + SQLite storage + FastAPI backend

- app.py: unified app – ntfy subscriber runs as background thread,
  FastAPI serves REST API (/api/messages) and static frontend
- static/index.html: terminal-style notification table with
  sortable columns, drag & drop column reorder, column visibility
  toggle (localStorage), text search, forwarded-only filter,
  auto-refresh every 30s
- All ntfy fields stored: id, received_at, ntfy_time, topic,
  title, message, priority, tags, forwarded
- /data volume for persistent SQLite DB
- Port 8000 exposed

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

Dockerfile

@@ -5,12 +5,18 @@ WORKDIR /app
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-COPY filter.py .
+COPY app.py filter.py ./
+COPY static/ static/
+
+VOLUME ["/data"]
 
 ENV SOURCE_URL=http://192.168.123.77/albert
 ENV TARGET_URL=
 ENV TARGET_TOKEN=
 ENV LOG_LEVEL=INFO
 ENV RECONNECT_DELAY=10
+ENV DB_PATH=/data/logwatch.db
 
-CMD ["python", "-u", "filter.py"]
+EXPOSE 8000
+
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8000"]