fix(makefile): improve generate-env command and script

- Fix bash error in generate_env.sh with proper environment variable handling
- Add docker-compose command detection for better compatibility
- Add generate-env-prod command with production warnings
- Make generate-env non-interactive by default for easier automation
- Add generate-env-interactive for when user input is needed
- Expand .env.example with more configuration options
- Add helpful production deployment warnings

Resolves: 'make generate-env generates nonsense' issue

scripts/generate_env.sh

@@ -51,14 +51,25 @@ while IFS= read -r line; do
 
   if [[ "$confirm" = true ]]; then
     # non-interactive: keep example defaults or environment overrides
-    if [[ -n "${!key-}" ]]; then
-      new_val="${!key}"
-      sed -i "s|^$key=.*|$key=$new_val|" "$TARGET"
+    env_val=""
+    if [[ -n "${!key:-}" ]]; then
+      env_val="${!key}"
+    fi
+    if [[ -n "$env_val" ]]; then
+      sed -i "s|^$key=.*|$key=$env_val|" "$TARGET"
     fi
     continue
   fi
 
-  read -p "$key [$current_val]: " new_val
+  # Interactive mode: prompt user for each variable
+  if read -t 1 -n 0 2>/dev/null; then
+    # stdin is available for reading
+    read -p "$key [$current_val]: " new_val || true
+  else
+    # no stdin available, skip prompting
+    new_val=""
+  fi
+  
   if [[ -n "$new_val" ]]; then
     sed -i "s|^$key=.*|$key=$new_val|" "$TARGET"
   fi