Implement auto-generation of ecosystem.config.js and improve container setup

- Add automatic ecosystem.config.js generation from package.json
- Create app directory automatically if missing
- Copy simple-website example when app directory is empty
- Remove redundant default app files from configs/
- Add HAProxy support with proper real IP forwarding
- Configure nginx to trust proxy headers from private networks
- Simplify entrypoint logic - always use /home/$user/app

This makes the container more user-friendly by eliminating the need for
manual PM2 configuration and ensuring the server always has a working app.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/generate-ecosystem-config.sh

@@ -0,0 +1,73 @@
+#!/bin/bash
+
+# Generate ecosystem.config.js from package.json
+# Usage: ./generate-ecosystem-config.sh <user> <app_path>
+
+user=$1
+app_path=$2
+
+if [ -z "$user" ] || [ -z "$app_path" ]; then
+  echo "Usage: $0 <user> <app_path>"
+  exit 1
+fi
+
+package_json="$app_path/package.json"
+ecosystem_config="$app_path/ecosystem.config.js"
+
+# Check if package.json exists
+if [ ! -f "$package_json" ]; then
+  echo "Error: package.json not found at $package_json"
+  exit 1
+fi
+
+# Extract values from package.json
+app_name=$(node -p "try { require('$package_json').name || 'node-app' } catch(e) { 'node-app' }")
+main_script=$(node -p "try { require('$package_json').main || 'index.js' } catch(e) { 'index.js' }")
+start_script=$(node -p "try { const scripts = require('$package_json').scripts; if (scripts && scripts.start) { scripts.start.replace(/^node\s+/, '') } else { null } } catch(e) { null }")
+
+# Use start script if available, otherwise use main field
+if [ "$start_script" != "null" ] && [ -n "$start_script" ]; then
+  script_file="$start_script"
+else
+  script_file="$main_script"
+fi
+
+# Clean up the script file name (remove any node command prefix)
+script_file=$(echo "$script_file" | sed 's/^node\s\+//')
+
+# Generate ecosystem.config.js
+cat > "$ecosystem_config" << EOF
+module.exports = {
+  apps: [{
+    name: '${app_name}',
+    script: '${script_file}',
+    instances: 1,
+    autorestart: true,
+    watch: false,
+    max_memory_restart: '256M',
+    kill_timeout: 3000,
+    wait_ready: true,
+    listen_timeout: 3000,
+    env: {
+      NODE_ENV: 'development',
+      PORT: 3000,
+      NODE_OPTIONS: '--max-old-space-size=200'
+    },
+    env_production: {
+      NODE_ENV: 'production',
+      PORT: 3000,
+      NODE_OPTIONS: '--max-old-space-size=200'
+    },
+    log_file: '/home/${user}/logs/nodejs/app.log',
+    error_file: '/home/${user}/logs/nodejs/error.log',
+    out_file: '/home/${user}/logs/nodejs/out.log',
+    log_date_format: 'YYYY-MM-DD HH:mm:ss Z',
+    log_type: 'json',
+    merge_logs: true,
+    max_restarts: 5,
+    min_uptime: '10s'
+  }]
+};
+EOF
+
+echo "Generated ecosystem.config.js for app: $app_name (script: $script_file)"