Fix server crashes: tcmalloc and workshop collection issues

- Add automatic tcmalloc disable in start scripts to prevent 'large alloc' segfaults
- Add warnings and documentation about workshop COLLECTION vs addon IDs
- Expand troubleshooting section with solutions for common crashes
- Document that -authkey deprecation warning can be safely ignored

Fixes:
- tcmalloc: large alloc XXXXXXX bytes == (nil) followed by Segmentation fault
- Item is not a collection! error when using addon ID instead of collection ID
- Missing 32-bit libraries warning with installation instructions

scripts/start.sh

@@ -57,9 +57,13 @@ else
 fi
 
 # Add workshop collection if provided
+# NOTE: Make sure WORKSHOP_COLLECTION is a COLLECTION ID, not an individual item ID!
+# You can verify at: https://steamcommunity.com/sharedfiles/filedetails/?id=YOUR_ID
+# If it says "Collection" it's valid. If it says "Addon" it will fail with "Item is not a collection!"
 if [[ -n "$WORKSHOP_COLLECTION" ]]; then
     ARGS="$ARGS +host_workshop_collection $WORKSHOP_COLLECTION"
     echo -e "${BLUE}[INFO]${NC} Workshop collection: $WORKSHOP_COLLECTION"
+    echo -e "${YELLOW}[WARNING]${NC} Ensure this is a Collection ID, not an individual addon ID!"
 fi
 
 echo ""
@@ -70,6 +74,13 @@ echo "  • Port: $PORT"
 echo "  • Gamemode: $GAMEMODE"
 echo ""
 
+# Disable tcmalloc which causes segfaults with large memory allocations
+# The error "tcmalloc: large alloc XXXXXXX bytes == (nil)" indicates memory allocation failure
+if [[ -f "$SERVER_DIR/bin/libtcmalloc_minimal.so.4" ]]; then
+    echo -e "${BLUE}[INFO]${NC} Disabling tcmalloc to prevent memory allocation crashes..."
+    mv "$SERVER_DIR/bin/libtcmalloc_minimal.so.4" "$SERVER_DIR/bin/libtcmalloc_minimal.so.4.disabled" 2>/dev/null || true
+fi
+
 echo -e "${GREEN}Starting server...${NC}"
 
 # Start the server