🔧 Implement deployment fixes and enhance Gitea workflows

- Created `DEPLOYMENT-FIXES.md` to document issues and solutions for Gitea Actions.
- Fixed Dockerfile path for standalone build.
- Enhanced `gitea-deploy.sh` with improved environment variable handling and extended health check timeouts.
- Introduced `gitea-deploy-simple.sh` for simplified deployments without database dependencies.
- Updated Next.js configuration to resolve build issues.
- Improved health check logic and error handling across all Gitea workflows.

✅ These changes enhance deployment reliability and provide better debugging information.

logs/gitea-deploy-simple.log

@@ -41,3 +41,25 @@
 [2025-09-13 23:36:54] 📊 Container name: portfolio-app-simple
 [2025-09-13 23:36:54] 📝 Logs: docker logs portfolio-app-simple
 Sat Sep 13 23:36:54 CEST 2025: Simplified Gitea deployment successful - Port: 3000 - Image: portfolio-app:20250913-233632
+[2025-09-13 23:46:31] 🚀 Starting simplified Gitea deployment for portfolio
+[2025-09-13 23:46:31] 🔨 Step 1: Building application...
+[2025-09-13 23:46:31] 📦 Building Next.js application...
+[SUCCESS] ✅ Application built successfully
+[2025-09-13 23:46:54] 🐳 Step 2: Docker operations...
+[2025-09-13 23:46:54] 🏗️ Building Docker image...
+[SUCCESS] ✅ Docker image built successfully
+[2025-09-13 23:48:01] 🚀 Step 3: Deploying application...
+[2025-09-13 23:48:01] 🚀 Starting new container on port 3000...
+[2025-09-13 23:48:01] ⏳ Waiting for container to be ready...
+[2025-09-13 23:48:21] 🏥 Performing health check...
+[SUCCESS] ✅ Application is healthy!
+[2025-09-13 23:48:21] ✅ Step 4: Verifying deployment...
+[SUCCESS] ✅ Main page is accessible
+[2025-09-13 23:48:22] 📊 Container status:
+[2025-09-13 23:48:22] 📈 Resource usage:
+[SUCCESS] 🎉 Simplified Gitea deployment completed successfully!
+[2025-09-13 23:48:23] 🌐 Application is available at: http://localhost:3000
+[2025-09-13 23:48:23] 🏥 Health check endpoint: http://localhost:3000/api/health
+[2025-09-13 23:48:23] 📊 Container name: portfolio-app-simple
+[2025-09-13 23:48:23] 📝 Logs: docker logs portfolio-app-simple
+Sat Sep 13 23:48:23 CEST 2025: Simplified Gitea deployment successful - Port: 3000 - Image: portfolio-app:20250913-234801