fix(docker): generic naming (mosaic-*), env-var-only config, no hardcoded values

- Renamed all jarvis-* to mosaic-* (generic for any deployment)
- Config files are .json.template with ${VAR} placeholders
- entrypoint.sh renders templates via envsubst at startup
- Ollama is optional: set OLLAMA_BASE_URL to auto-inject provider
- Model is configurable via OPENCLAW_MODEL env var
- No hardcoded IPs, keys, model names, or user preferences
- Updated README with full env var reference

docker/openclaw-instances/mosaic-operations.env

@@ -0,0 +1,14 @@
+# Mosaic Agent: operations
+# Fill in all values before deploying.
+
+# Required: LLM provider API key (Z.ai, OpenAI, etc.)
+ZAI_API_KEY=
+
+# Required: unique bearer token for this agent instance (generate: openssl rand -hex 32)
+OPENCLAW_GATEWAY_TOKEN=
+
+# Optional: override default model (default: zai/glm-5)
+# OPENCLAW_MODEL=zai/glm-5
+
+# Optional: Ollama endpoint for local inference (uncomment to enable)
+# OLLAMA_BASE_URL=