feat(security): enhance file path validation and implement non-root D… (#5474)

* feat(security): enhance file path validation and implement non-root Docker user

- Validate resolved full file paths including workspace boundaries in SecureFileStore
- Resolve paths before validation in readFile and writeFile operations
- Run Docker container as non-root flowise user (uid/gid 1001)
- Apply proper file ownership and permissions for application files

Prevents path traversal attacks and follows container security best practices

* Add sensitive system directory validation and Flowise internal file protection

* Update Dockerfile to use default node user

* update validation patterns to include additional system binary directories (/usr/bin, /usr/sbin, /usr/local/bin)

* added isSafeBrowserExecutable function to validate browser executable paths for Playwright and Puppeteer loaders

---------

Co-authored-by: taraka-vishnumolakala <taraka.vishnumolakala@workday.com>
Co-authored-by: Henry Heng <henryheng@flowiseai.com>
Co-authored-by: Henry <hzj94@hotmail.com>

packages/components/nodes/documentloaders/Playwright/Playwright.ts

@@ -10,6 +10,7 @@ import { test } from 'linkifyjs'
 import { omit } from 'lodash'
 import { handleEscapeCharacters, INodeOutputsValue, webCrawl, xmlScrape } from '../../../src'
 import { ICommonObject, INode, INodeData, INodeParams } from '../../../src/Interface'
+import { isSafeBrowserExecutable } from '../../../src/validator'
 
 class Playwright_DocumentLoaders implements INode {
     label: string
@@ -190,11 +191,17 @@ class Playwright_DocumentLoaders implements INode {
         async function playwrightLoader(url: string): Promise<Document[] | undefined> {
             try {
                 let docs = []
+
+                const executablePath = process.env.PLAYWRIGHT_EXECUTABLE_PATH
+                if (!isSafeBrowserExecutable(executablePath)) {
+                    throw new Error(`Invalid or unsafe browser executable path: ${executablePath || 'undefined'}. `)
+                }
+
                 const config: PlaywrightWebBaseLoaderOptions = {
                     launchOptions: {
                         args: ['--no-sandbox'],
                         headless: true,
-                        executablePath: process.env.PLAYWRIGHT_EXECUTABLE_FILE_PATH
+                        executablePath: executablePath
                     }
                 }
                 if (waitUntilGoToOption) {