fix(ci): correct playwright config paths and add env example files

- Fix testDir path from './src/__tests__/e2e' to './e2e'
- Fix globalSetup path from './src/__tests__/e2e/global.setup' to './e2e/global.setup'
- Create .env.development.example with development database configuration
- Update .gitignore to allow .env.example files to be tracked

.gitignore

@@ -34,7 +34,14 @@ yarn-error.log*
 .pnpm-debug.log*
 
 # env files (can opt-in for committing if needed)
-.env*
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+# Allow example env files to be tracked
+!.env.example
+!.env.development.example
 
 # vercel
 .vercel