Add Docker containerization stack

- Dockerfile: multi-stage Python 3.13-slim, healthcheck, uvicorn CMD
- docker-compose.yml: full stack (cAIc, SearXNG, Qdrant, RabbitMQ,
  llama-server, Ollama) with healthchecks, volumes, secrets
- .dockerignore: exclude venv, tests, .git, models, secrets
- .env.example: all variables documented with generation hints
- scripts/setup.sh: first-run scaffolding (generates .env, secrets,
  SearXNG config, directories)
- searxng-settings.yml.dist: SearXNG config template
- models/README.txt: instructions for placing .gguf files
- config.py: add HW_STATE_PATH env var (CAIC_HW_STATE_PATH)
- hardware.py: read state path from config instead of hardcoded CWD
- requirements.txt: add missing psutil and jinja2

hardware.py

@@ -12,11 +12,11 @@ from pathlib import Path
 import httpx
 import psutil
 
-from config import LLAMA_SERVER_BASE, SEARXNG_BASE, QDRANT_URL
+from config import LLAMA_SERVER_BASE, SEARXNG_BASE, QDRANT_URL, HW_STATE_PATH
 
 log = logging.getLogger("caic")
 
-HARDWARE_STATE_PATH = Path("hardware_state.json")
+HARDWARE_STATE_PATH = Path(HW_STATE_PATH)
 _TIMEOUT_EXPIRED = subprocess.TimeoutExpired