Add photo galleries API and frontend for public and admin viewing.

Introduces the Go photo-api service, nginx/systemd deploy wiring, and Next.js gallery/lightbox pages so event photos can be managed and browsed.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/spanglish-photos.service

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+[Unit]
+Description=Spanglish Photo Gallery API
+Documentation=https://git.azzamo.net/Michilis/Spanglish
+After=network.target spanglish-backend.service
+
+[Service]
+Type=simple
+User=spanglish
+Group=spanglish
+WorkingDirectory=/home/spanglish/Spanglish/photo-api
+EnvironmentFile=/home/spanglish/Spanglish/photo-api/.env
+Environment=PORT=3020
+# Apply pending photos_* migrations before serving (idempotent, advisory-locked)
+ExecStartPre=/home/spanglish/Spanglish/photo-api/bin/photo-api migrate
+ExecStart=/home/spanglish/Spanglish/photo-api/bin/photo-api
+Restart=on-failure
+RestartSec=10
+StandardOutput=syslog
+StandardError=syslog
+SyslogIdentifier=spanglish-photos
+
+# Security hardening (mirrors spanglish-backend.service)
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=read-only
+ReadWritePaths=/home/spanglish/Spanglish/photo-api/data
+
+[Install]
+WantedBy=multi-user.target