feat(openclaw-memory): add OpenClaw + Hindsight memory cookbook application

[benfrank241]

Summary

• Adds applications/openclaw-memory/ — a new cookbook entry for the @vectorize-io/hindsight-openclaw plugin
• Covers all three backends: Hindsight Cloud, embedded local daemon, self-hosted API
• Includes example configs, bash helper scripts, and a full README following the existing cookbook structure
• Updates root README.md to list the new application

Contents

applications/openclaw-memory/
├── README.md
├── .gitignore
├── configs/
│   ├── openclaw.embedded.example.json
│   ├── openclaw.cloud.example.json
│   └── openclaw.external.example.json
└── scripts/
    ├── setup.sh
    └── inspect-memory.sh