refactor: remove all SQLite code, standardize on PostgreSQL

- Remove database provider switching logic from prisma.ts and auth.ts
- Hardcode PostgreSQL as the only supported database
- Remove switch-database.js and use-dev-db.js scripts
- Remove Python utility scripts that used sqlite3 directly
- Update justfile to remove SQLite test targets
- Update package.json to remove db:switch script
- Update Dockerfile.ci-base to default to PostgreSQL
- Update .env.example to remove SQLite mention
- Update playwright.config.ts comments
- Update .gitignore to remove SQLite file patterns

This eliminates the root cause of test failures: the dev server and test
Prisma client were using different databases (PostgreSQL vs SQLite).

e2e/cucumber/step-definitions/auth-steps.ts

@@ -124,34 +124,67 @@ Given('I am logged in as a tournament admin', async function () {
   await world.page.fill('input[name="password"]', credentials.password);
   
   await world.page.click('button[type="submit"]');
-  // Wait for redirect
-  await world.page.waitForURL(/\/players\/\d+\/profile/, { timeout: 15000 });
   
-  // Extract user ID from the URL (e.g., /players/2147/profile)
+  // Wait for any redirect away from register page
+  await world.page.waitForURL((url) => !url.toString().includes('/auth/register'), { timeout: 15000 });
+  await world.page.waitForLoadState('networkidle');
+  await world.page.waitForTimeout(1000);
+  
   const currentUrl = world.page.url();
+  console.log(`🌍 After registration, URL: ${currentUrl}`);
+  
+  // Try to extract player ID from URL
   const match = currentUrl.match(/\/players\/(\d+)\/profile/);
   if (match) {
-    const playerId = match[1];
-    world.playerId = playerId;
+    world.playerId = match[1];
+    console.log(`🌍 Player ID from URL: ${world.playerId}`);
+  }
+  
+  // Get the user ID from the database (works regardless of redirect destination)
+  const prisma = await world.getPrisma();
+  console.log(`🌍 Looking up user by email: ${credentials.email}`);
+  const user = await prisma.user.findUnique({
+    where: { email: credentials.email },
+    include: { player: true }
+  });
+  
+  if (user) {
+    (world.user as any).id = user.id;
+    console.log(`🌍 User ID from DB: ${user.id}, role: ${user.role}, playerId: ${user.playerId}`);
     
-    // Get the user ID from the database
-    const prisma = await world.getPrisma();
-    const player = await prisma.player.findUnique({
-      where: { id: parseInt(playerId) },
-      include: { user: true }
+    if (user.player) {
+      world.playerId = user.player.id.toString();
+      console.log(`🌍 Player ID from DB: ${world.playerId}`);
+    }
+    
+    // Assign tournament_admin role
+    await prisma.user.update({
+      where: { id: user.id },
+      data: { role: 'tournament_admin' }
     });
+    console.log(`🌍 Assigned tournament_admin role to user: ${user.id}`);
     
-    if (player && player.user) {
-      const userId = player.user.id;
-      (world.user as any).id = userId;
-      console.log(`🌍 User ID extracted: ${userId}`);
+    // Navigate to trigger a fresh role fetch
+    await world.page.goto(`${world.baseURL}/rankings`);
+    await world.page.waitForLoadState('networkidle');
+    await world.page.waitForTimeout(500);
+  } else {
+    console.log(`🌍 WARNING: User not found in DB by email. Trying to find latest user...`);
+    // Fallback: find the latest user (most recently created)
+    const latestUser = await prisma.user.findFirst({
+      orderBy: { createdAt: 'desc' },
+      include: { player: true }
+    });
+    if (latestUser) {
+      (world.user as any).id = latestUser.id;
+      world.playerId = latestUser.playerId?.toString() || latestUser.player?.id?.toString();
+      console.log(`🌍 Using latest user: ${latestUser.id} (${latestUser.email})`);
       
-      // Assign tournament_admin role to the user
       await prisma.user.update({
-        where: { id: userId },
+        where: { id: latestUser.id },
         data: { role: 'tournament_admin' }
       });
-      console.log(`🌍 Assigned tournament_admin role to user: ${userId}`);
+      console.log(`🌍 Assigned tournament_admin role`);
     }
   }