Add Open Library Omi integration app

plugins/omi-open-library-app/.gitignore

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+.venv/
+__pycache__/
+*.pyc

plugins/omi-open-library-app/Procfile

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+web: uvicorn main:app --host 0.0.0.0 --port ${PORT:-8080}

plugins/omi-open-library-app/README.md

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+# Open Library x Omi
+
+Search books, fetch metadata, and browse subject recommendations from Omi conversations.
+
+This is a standalone no-auth Omi app backed by the public Open Library APIs. It does not require environment variables, OAuth, or an Open Library API key.
+
+## Tools
+
+- `search_books`: search books by free-form query, optional author, and optional subject.
+- `get_book_details`: fetch work metadata by Open Library work ID or edition metadata by ISBN.
+- `search_subject`: browse notable books for a subject such as fantasy, economics, or machine learning.
+
+## Local Development
+
+```bash
+python -m venv .venv
+source .venv/bin/activate
+pip install -r requirements.txt
+uvicorn main:app --reload --port 8080
+```
+
+Health check:
+
+```bash
+curl http://localhost:8080/health
+```
+
+Tool manifest:
+
+```bash
+curl http://localhost:8080/.well-known/omi-tools.json
+```
+
+Search books:
+
+```bash
+curl -X POST http://localhost:8080/tools/search_books \
+  -H "Content-Type: application/json" \
+  -d '{"query":"The Left Hand of Darkness", "limit":3}'
+```
+
+Fetch work details:
+
+```bash
+curl -X POST http://localhost:8080/tools/get_book_details \
+  -H "Content-Type: application/json" \
+  -d '{"work_id":"OL59895W"}'
+```
+
+Browse a subject:
+
+```bash
+curl -X POST http://localhost:8080/tools/search_subject \
+  -H "Content-Type: application/json" \
+  -d '{"subject":"science fiction", "limit":5}'
+```
+
+## Deployment
+
+The app is ready for Railway or Heroku-style deployment:
+
+- `Procfile` starts uvicorn on `$PORT`
+- `railway.toml` defines the same start command and `/health` check
+- `runtime.txt` pins Python 3.11
+
+## Notes
+
+Open Library is a public community catalog. Metadata completeness varies by work and edition, so some fields may be missing for less common books.