feat: Implement tournament schedule tab and fix E2E tests (#27)

## Summary

This PR implements the tournament schedule tab functionality and fixes all remaining E2E test failures.

### Changes Included

1. **Tournament Schedule Feature**
   - Added tournament schedule page at `/admin/tournaments/[id]/schedule`
   - Implemented "Generate Schedule" button functionality
   - Added schedule generation logic for round-robin tournaments

2. **E2E Test Fixes**
   - Fixed database connection issues in production builds
   - Improved test reliability with better error handling and debugging
   - Updated test infrastructure to use environment variables instead of hardcoded values

3. **CI/CD Updates**
   - Added E2E test job to PR workflow
   - Configured tests to run against development database
   - Moved database password to Gitea secrets

4. **Code Quality**
   - Removed hardcoded passwords from codebase
   - Improved Prisma client configuration
   - Enhanced authentication and navigation components

### Test Results
All 16 E2E test scenarios are now passing:
- Authentication tests: ✅
- Registration tests: ✅
- Tournament schedule tests: ✅
- Player schedule tests: ✅
- Admin navigation tests: ✅

### Database Configuration
- Tests run against `euchre_camp_dev` database
- Production builds use environment variables for database configuration
- Database password stored in Gitea secrets as `DB_PASSWORD`

### CI Pipeline
The PR workflow now includes:
1. Unit tests
2. E2E tests (using production build)
3. Version bump analysis

E2E tests must pass before PR can be merged.

Reviewed-on: #27
Co-authored-by: David Gwilliam <dhgwilliam@gmail.com>
Co-committed-by: David Gwilliam <dhgwilliam@gmail.com>

src/__tests__/unit/user-management.test.ts

@@ -11,10 +11,10 @@ import { prisma } from '@/lib/prisma';
 import type { User, Player } from '@prisma/client';
 
 // Create mock functions at module level
-const getSessionMock = mock(() => {});
-const userFindUniqueMock = mock(() => {});
-const userUpdateMock = mock(() => {});
-const playerFindUniqueMock = mock(() => {});
+const getSessionMock = mock(async (): Promise<any> => null);
+const userFindUniqueMock = mock(async (): Promise<any> => null);
+const userUpdateMock = mock(async (): Promise<any> => ({}));
+const playerFindUniqueMock = mock(async (): Promise<any> => null);
 
 // Mock the getSession and prisma functions
 mock.module('@/lib/auth-simple', () => ({
@@ -63,10 +63,10 @@ const createMockPlayer = (id: number, name: string): Player => ({
 describe('User Management', () => {
   beforeEach(() => {
     // Reset mock implementations to default (no-op) before each test
-    getSessionMock.mockImplementation(() => undefined);
-    userFindUniqueMock.mockImplementation(() => undefined);
-    userUpdateMock.mockImplementation(() => undefined);
-    playerFindUniqueMock.mockImplementation(() => undefined);
+    getSessionMock.mockImplementation(async () => undefined);
+    userFindUniqueMock.mockImplementation(async () => undefined);
+    userUpdateMock.mockImplementation(async () => undefined);
+    playerFindUniqueMock.mockImplementation(async () => undefined);
   });
 
   describe('User Name Editing', () => {