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/app/api/tournaments/[id]/participants/route.ts

@@ -2,6 +2,54 @@ import { NextResponse } from "next/server";
 import { prisma } from "@/lib/prisma";
 import { canManageTournament } from "@/lib/permissions";
 
+/**
+ * GET /api/tournaments/[id]/participants
+ * 
+ * Get all participants for a tournament
+ */
+export async function GET(
+  request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await params
+    const tournamentId = parseInt(id, 10);
+    
+    if (isNaN(tournamentId)) {
+      return NextResponse.json(
+        { error: "Invalid tournament ID" },
+        { status: 400 }
+      );
+    }
+    
+    // Check permissions
+    const permission = await canManageTournament(tournamentId);
+    if (!permission.allowed) {
+      return NextResponse.json(
+        { error: permission.reason || 'Insufficient permissions' },
+        { status: 403 }
+      );
+    }
+
+    // Fetch participants with player details
+    const participants = await prisma.eventParticipant.findMany({
+      where: { eventId: tournamentId },
+      include: {
+        player: true,
+      },
+      orderBy: { registrationDate: 'desc' },
+    });
+
+    return NextResponse.json({ participants });
+  } catch (error) {
+    console.error("Failed to fetch participants:", error);
+    return NextResponse.json(
+      { error: "Failed to fetch participants" },
+      { status: 500 }
+    );
+  }
+}
+
 export async function POST(
   request: Request,
   { params }: { params: Promise<{ id: string }> }
@@ -36,7 +84,30 @@ export async function POST(
       );
     }
 
-    // Add participants to tournament
+    // Fetch tournament to check type
+    const tournament = await prisma.event.findUnique({
+      where: { id: tournamentId },
+      select: { tournamentType: true },
+    });
+
+    if (!tournament) {
+      return NextResponse.json(
+        { error: "Tournament not found" },
+        { status: 404 }
+      );
+    }
+
+    const isTeamTournament = tournament.tournamentType === "team";
+
+    // For team tournaments, validate even number of players
+    if (isTeamTournament && playerIds.length % 2 !== 0) {
+      return NextResponse.json(
+        { error: "Team tournaments require an even number of players" },
+        { status: 400 }
+      );
+    }
+
+    // Add participants - teams will be generated later during schedule generation
     const participants = await Promise.all(
       playerIds.map(async (playerId: number) => {
         try {
@@ -83,3 +154,63 @@ export async function POST(
     );
   }
 }
+
+/**
+ * DELETE /api/tournaments/[id]/participants
+ * 
+ * Remove participants from a tournament
+ */
+export async function DELETE(
+  request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await params
+    const tournamentId = parseInt(id, 10);
+    
+    if (isNaN(tournamentId)) {
+      return NextResponse.json(
+        { error: "Invalid tournament ID" },
+        { status: 400 }
+      );
+    }
+    
+    const body = await request.json();
+    const { playerIds } = body;
+
+    if (!playerIds || !Array.isArray(playerIds)) {
+      return NextResponse.json(
+        { error: "playerIds array is required" },
+        { status: 400 }
+      );
+    }
+
+    // Check permissions
+    const permission = await canManageTournament(tournamentId);
+    if (!permission.allowed) {
+      return NextResponse.json(
+        { error: permission.reason || 'Insufficient permissions' },
+        { status: 403 }
+      );
+    }
+
+    // Remove participants
+    const deleted = await prisma.eventParticipant.deleteMany({
+      where: {
+        eventId: tournamentId,
+        playerId: { in: playerIds },
+      },
+    });
+
+    return NextResponse.json({
+      success: true,
+      deleted: deleted.count,
+    });
+  } catch (error) {
+    console.error("Failed to remove participants:", error);
+    return NextResponse.json(
+      { error: "Failed to remove participants" },
+      { status: 500 }
+    );
+  }
+}