Add initial project structure with Maven, Quarkus, and React setup

- Created .gitignore to exclude build artifacts and IDE files.
- Added pom.xml for Maven project configuration, including dependencies for Quarkus, OpenAPI, and testing.
- Introduced project documentation outlining development workflow, architecture, and coding standards.
- Implemented core business logic with services for authentication, scenario management, story lifecycle, and user management.
- Established security context for JWT-based authentication.
- Generated API specifications and client code for frontend integration.
- Set up initial database entities and repositories for user, scenario, and story management.

.gitignore

@@ -0,0 +1,35 @@
+/target/
+/src/main/web/node_modules/
+/src/main/web/node/
+/.idea/
+/.DS_Store
+# Maven / Java build output
+target/
+
+# Frontend (src/main/web) temporary and build artifacts
+src/main/web/node_modules/
+src/main/web/dist/
+src/main/web/.vite/
+src/main/web/.cache/
+src/main/web/.eslintcache
+src/main/web/coverage/
+src/main/web/npm-debug.log*
+src/main/web/yarn-debug.log*
+src/main/web/yarn-error.log*
+src/main/web/pnpm-debug.log*
+
+# IntelliJ IDEA
+.idea/
+*.iml
+out/
+
+# Other common IDE/editor files
+.vscode/
+*.swp
+*.swo
+
+# Generated API client (regenerated by mvn generate-sources)
+src/main/web/src/api/generated/
+
+# OS files
+.DS_Store