fix: update itext-core to 9.4.0 with html2pdf 6.0.0 compatibility (#325)

* chore(deps): bump com.itextpdf:itext-core in /apps/backend

Bumps [com.itextpdf:itext-core](https://github.com/itext/itext7) from 8.0.5 to 9.4.0.
- [Release notes](https://github.com/itext/itext7/releases)
- [Commits](itext/itext-java@8.0.5...9.4.0)

---
updated-dependencies:
- dependency-name: com.itextpdf:itext-core
  dependency-version: 9.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* fix: update html2pdf to 6.0.0 for itext-core 9.x compatibility

itext-core 9.x requires html2pdf 6.x for proper compatibility.
Updated from 5.0.5 to 6.0.0 to resolve NoClassDefFoundError issues.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* chore: use pre-built devcontainer image from ghcr.io

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: 3 people

.devcontainer/docker-compose.yml

@@ -2,9 +2,11 @@ version: '3.8'
 
 services:
   devcontainer:
-    build:
-      context: ..
-      dockerfile: .devcontainer/Dockerfile
+    image: ghcr.io/simpleaccounts/simpleaccounts-uae-devcontainer:latest
+    # For local development/testing, uncomment below and comment out image:
+    # build:
+    #   context: ..
+    #   dockerfile: .devcontainer/Dockerfile
     volumes:
       - ..:/workspaces/SimpleAccounts-UAE:cached
       - devcontainer-vscode-extensions:/home/vscode/.vscode-server/extensions

apps/backend/src/main/java/com/simpleaccounts/util/PasswordHashGenerator.java

@@ -25,3 +25,4 @@ public static void main(String[] args) {
 
 
 
+