Rebuild openclaw from npm instead of premade image, configure Ollama

- Add Dockerfile using node:22-bookworm-slim + npm install -g openclaw@latest
- Update docker-compose.yml: use local build, add OLLAMA_API_KEY=ollama-local,
  remove legacy OPENCLAW_AGENT_PROVIDER/MODEL/OLLAMA_BASE_URL env vars
- Add setup.sh to create openclaw.json with explicit Ollama provider config

Key fixes vs previous attempt:
- Config file is openclaw.json (not config.json or auth-profiles.json)
- models.providers.ollama needs baseUrl with /v1 suffix + explicit model list
- OLLAMA_API_KEY env var is required to opt in to Ollama support
- reasoning:false on models prevents 400 errors from Ollama

openclaw/Dockerfile

@@ -0,0 +1,17 @@
+FROM node:22-bookworm-slim
+
+# Install git and ca-certificates required by openclaw's npm dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends git ca-certificates && rm -rf /var/lib/apt/lists/*
+
+# Rewrite any SSH GitHub URLs to HTTPS so npm install works without SSH keys
+RUN git config --global url."https://github.com/".insteadOf "ssh://git@github.com/"
+
+# Install openclaw from npm (same approach as the official docker-setup.sh)
+RUN npm install -g openclaw@latest --loglevel=error
+
+ENV HOME=/home/node
+ENV TERM=xterm-256color
+
+# Run as non-root node user (uid 1000), same as official image
+USER node
+WORKDIR /home/node