…management with CRUD operations.

… with reactive REST.

… operations, pagination, error handling, and content types.

- Add `productId` field with unique constraint to Inventory entity
- Implement `findByProductId` and `existsByProductId` lookup methods
- Include `quarkus-smallrye-openapi` dependency for API documentation
- Apply OpenAPI annotations to resource endpoints and models

Add detailed README.md documenting the RESTful inventory management
microservice including features, prerequisites, running instructions,
API endpoints with examples, data model, and error handling.

Integrate Quarkus Cache to optimize read performance for inventory lookups. This change adds caching for GET requests by ID and Product ID, with automatic invalidation on data modification.

- Add `quarkus-cache` dependency.
- Cache `getById` and `getByProductId` endpoints.
- Invalidate caches on create, update, and delete operations.
- Add `DELETE /api/inventory/cache` endpoint for manual cache clearing.
- Update README with caching configuration and usage details.

Introduces the CI/CD infrastructure and core application settings required to build, run, and deploy the inventory-quarkus service.

- **CI/CD**: Adds a multi-stage Jenkinsfile covering source checkout, validation, build, testing, Docker image creation, and Kubernetes deployment.
- **Configuration**: Sets up `application.properties` for PostgreSQL, OIDC (Keycloak), structured JSON logging, and Micrometer metrics.
- **Database**: Includes the initial Flyway migration script to define the database schema.

Removes explicit property definitions for fault tolerance (timeout, circuit breaker, retry) and the micrometer JVM binder. Fault tolerance settings are now managed via annotations in the code.