feat: implement StaySense MVP backend, frontend, imports, and deployment docs

deploy/nginx/staysense.conf

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+server {
+    listen 80;
+    server_name staysense.example.com;
+
+    root /opt/staysense/src;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location /api/ {
+        proxy_pass http://127.0.0.1:8787/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+}

deploy/systemd/staysense-api.service

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+[Unit]
+Description=StaySense API Service
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=www-data
+Group=www-data
+WorkingDirectory=/opt/staysense/backend
+Environment=STAYSENSE_SERVER_SALT=CHANGE_ME
+Environment=STAYSENSE_SIGNAL_COOLDOWN_HOURS=24
+ExecStart=/usr/bin/python3 /opt/staysense/backend/server.py
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target

deploy/systemd/staysense-import.service

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+[Unit]
+Description=StaySense Data Import Job
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+User=www-data
+Group=www-data
+WorkingDirectory=/opt/staysense/backend
+ExecStart=/usr/bin/python3 /opt/staysense/backend/run_import_jobs.py --config /opt/staysense/docs/open_data_sources.json --prune-legacy

deploy/systemd/staysense-import.timer

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+[Unit]
+Description=Run StaySense import every 6 hours
+
+[Timer]
+OnBootSec=5min
+OnUnitActiveSec=6h
+Unit=staysense-import.service
+Persistent=true
+
+[Install]
+WantedBy=timers.target