fix: correct package versions and npm flags

Frontend package.json fixes:
- react-router-dom: ^6.31.0 → ^6.30.1 (6.31.0 doesn't exist)
- postcss: ^8.5.1 → ^8.5.6 (use latest stable version)

Setup script fixes:
- Replace deprecated --production flag with --omit=dev
- Resolves npm warning: 'npm WARN config production Use --omit=dev instead'

Fixes npm install errors:
- 'No matching version found for react-router-dom@^6.31.0'
- Deprecated npm configuration warnings

README.md

@@ -68,6 +68,21 @@ For getting started with Docker, see the [Docker documentation](https://github.c
 
 Run on a clean Ubuntu/Debian server with internet access:
 
+#### Debian:
+```bash
+apt update -y
+apt upgrade -y
+apt install curl -y
+```
+
+#### Ubuntu:
+```bash
+apt-get update -y
+apt-get upgrade -y
+apt install curl -y
+```
+
+#### Script
 ```bash
 curl -fsSL -o setup.sh https://raw.githubusercontent.com/9technologygroup/patchmon.net/main/setup.sh && chmod +x setup.sh && bash setup.sh
 ```

frontend/package.json

@@ -26,7 +26,7 @@
     "react-chartjs-2": "^5.2.0",
     "react-dom": "^18.3.1",
     "react-icons": "^5.5.0",
-    "react-router-dom": "^6.31.0"
+    "react-router-dom": "^6.30.1"
   },
   "devDependencies": {
     "@eslint/js": "^9.17.0",
@@ -39,7 +39,7 @@
     "eslint-plugin-react-hooks": "^5.1.0",
     "eslint-plugin-react-refresh": "^0.4.16",
     "globals": "^15.14.0",
-    "postcss": "^8.5.1",
+    "postcss": "^8.5.6",
     "tailwindcss": "^3.4.17",
     "vite": "^7.1.5"
   },

setup.sh

@@ -722,7 +722,7 @@ install_dependencies() {
         export NPM_CONFIG_CACHE=$APP_DIR/.npm
         export NPM_CONFIG_PREFIX=$APP_DIR/.npm-global
         export NPM_CONFIG_TMP=$APP_DIR/.npm/tmp
-        npm install --production --no-audit --no-fund --no-save
+        npm install --omit=dev --no-audit --no-fund --no-save
     "; then
         print_error "Failed to install root dependencies"
         return 1
@@ -737,7 +737,7 @@ install_dependencies() {
         export NPM_CONFIG_CACHE=$APP_DIR/.npm
         export NPM_CONFIG_PREFIX=$APP_DIR/.npm-global
         export NPM_CONFIG_TMP=$APP_DIR/.npm/tmp
-        npm install --production --no-audit --no-fund --no-save
+        npm install --omit=dev --no-audit --no-fund --no-save
     "; then
         print_error "Failed to install backend dependencies"
         return 1