feat: D&D SRD 5.2 API — FastAPI app with flat JSON caching

- Data fetched from Open5e API: 3,215 items (339 spells, 330 creatures,
  24 classes, 2,319 magic items, 203 equipment)
- FastAPI app with API key auth (X-API-Key header or ?api_key= param)
- Sliding window rate limiting (60 req/min, 10K req/day)
- Dice rolling endpoint (e.g., /api/dice/roll?spec=2d20+5)
- Full-text search across all resource types
- Pagination, filtering (name, level, school, class, etc.)
- Admin CLI for API key management
- nginx + systemd service ready for deployment

scripts/dnd-api.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=D&D SRD 5.2 API Server
+After=network.target
+
+[Service]
+Type=simple
+User=hermes
+WorkingDirectory=/home/hermes/workspace/dnd-srd-api
+ExecStart=/usr/local/lib/hermes-agent/venv/bin/uvicorn app.main:app --host 127.0.0.1 --port 8000
+Restart=on-failure
+RestartSec=5
+
+Environment=PYTHONUNBUFFERED=1
+
+[Install]
+WantedBy=multi-user.target