docs(repo): add keep-a-changelog formatted CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Kubernetes deployment manifests for API, App, Processing Worker, and PostgreSQL (`#217`).
+- Health check endpoints (`/api/health`, `/livez`, `/healthz`) to support container orchestrator probes.
+- `SECURITY.md` policy covering supported versions, SLAs, and private vulnerability reporting.
+- Comprehensive `CONTRIBUTING.md` guide covering monorepo setup, conventional commits, and PR expectations.
+- PostgreSQL-backed `TagsDbRepository` and `StreamsDbRepository` for secure, parameterized data access.
+- User registration page (`/auth/register`) in the Next.js frontend with Zod schema validation.
+
+### Changed
+
+- `StreamOwnershipService` in API backend now safely queries the PostgreSQL database via parameterized queries instead of relying on demo environment variables.
+- Prepared `AdminStatsService` for database integration to aggregate platform-wide stats.
+
+### Fixed
+
+- UI `ConfirmDialog` component now properly handles async states and prevents dialog dismissal while action promises are pending.
+
+## [1.0.0] - 2024-05-24
+
+### Added
+
+- Initial release of the XStreamRoll platform.
+- `app`: Next.js 16 user-facing web frontend.
+- `api`: NestJS 10 REST and WebSocket backend.
+- `xstreamroll-sdk`: Lightweight, isomorphic TypeScript client for publishing events and API interaction.
+- `xstreamroll-processing`: Dedicated Node.js and TypeScript worker for real-time stream data processing.
+- `database`: Initial PostgreSQL schema and migrations.
+
+<!-- Links -->
+
+[Unreleased]: https://github.com/XStreamRollz/XStreamRoll/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/XStreamRollz/XStreamRoll/releases/tag/v1.0.0