Add Spring Boot Java projects

[BootifulDeveloper]

Motivation

• Surface several Spring Boot / Java back-end projects in the portfolio so they appear in the featured, projects, and archive views.

Description

• Added three new project entries to src/pages/portfolio/projectsData.json: Inventory Management API, Employee Leave Management, and Library Management System with summaries, highlights, stacks, categories, years, and roles.
• Added matching SVG artwork files under public/projectImages/ for the three new Spring projects.
• Updated UI code in src/components/Project.js, src/pages/projects/ProjectsOverview.js, src/pages/projects/ProjectDetails.js, and src/pages/projects/ProjectArchive.js to only render GitHub / Live buttons when the corresponding URLs exist to avoid empty/broken links.

Testing

• Ran npm run build which completed successfully and produced an optimized build.
• Ran CI=true npm test -- --watchAll=false which exited with code 1 because the repo contains no tests, and then re-ran with --passWithNoTests which exited successfully.
• Attempted to capture a Playwright screenshot, but browser installation failed due to a 403 from the Playwright CDN, so automated screenshot could not be produced; the development server was also started and compiled successfully.

---

Codex Task