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

.dockerignore

@@ -0,0 +1,44 @@
+# Version control
+.git/
+.gitignore
+
+# Python
+venv/
+__pycache__/
+*.pyc
+*.pyo
+.pytest_cache/
+.mypy_cache/
+
+# Databases and state (persisted via volumes)
+*.db
+hardware_state.json
+
+# Secrets (generated by setup.sh)
+.env
+secrets/
+searxng/
+
+# IDE / editor
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Models (bind-mounted at runtime)
+models/
+
+# Documentation (not needed in image)
+*.md
+docs/
+TASKS.md
+docker.md
+ai.md
+CLAUDE.md
+scripts/
+tests/