feat: update CI/CD to use Bun

- Update Dockerfile to use oven/bun:alpine image
- Update PR workflow to use Bun (oven/setup-bun action)
- Update Test workflow to use Bun
- Update Release workflow to use Bun
- Remove test.yml workflow (redundant with PR workflow)
- Update Docker build commands to use Bun
- Docker build verified working

AGENTS.md

@@ -9,11 +9,12 @@ EuchreCamp is a Next.js 14+ application for managing Euchre tournaments and trac
 ### Key Technologies
 - **Next.js 14+** (App Router)
 - **TypeScript**
-- **Prisma ORM** (SQLite)
+- **Prisma ORM** (SQLite/PostgreSQL)
 - **Tailwind CSS**
 - **Better Auth** (Authentication)
-- **Vitest** (Unit Testing)
+- **Bun** (Package Manager & Test Runner)
 - **Playwright** (Acceptance Testing)
+- **Vitest** (Legacy - migrated to Bun test runner)
 
 ## Architecture Patterns
 
@@ -37,13 +38,39 @@ EuchreCamp is a Next.js 14+ application for managing Euchre tournaments and trac
 
 ## Common Tasks
 
+### Package Manager: Bun
+
+This project uses **Bun** as the package manager and test runner:
+
+```bash
+# Install dependencies
+bun install
+
+# Run development server
+bun run dev
+
+# Build the application
+bun run build
+
+# Run unit/component tests
+bun test
+
+# Run acceptance tests (Playwright)
+bun run test:acceptance
+
+# Run linting
+bun run lint
+```
+
+**Note**: E2E tests still use Playwright, as Bun's test runner doesn't support browser automation. Unit and component tests have been migrated to Bun's native test runner for faster execution.
+
 ### Admin User Creation
 
 To create an admin user, use the provided scripts:
 
 **Option 1: Using Better Auth API (Recommended)**
 ```bash
-node scripts/create-admin-via-api.js
+bun run scripts/create-admin-via-api.js
 ```
 This creates the admin user `david@dhg.lol` with password `adminadmin` using Better Auth's internal API.