Bump py7zr from 0.20.5 to 1.0.0 in /backend

Bumps [py7zr](https://github.com/miurahr/py7zr) from 0.20.5 to 1.0.0.
- [Release notes](https://github.com/miurahr/py7zr/releases)
- [Changelog](https://github.com/miurahr/py7zr/blob/master/docs/Changelog.rst)
- [Commits](miurahr/py7zr@v0.20.5...v1.0.0)

---
updated-dependencies:
- dependency-name: py7zr
  dependency-version: 1.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/requirements-ml.txt

@@ -32,7 +32,7 @@ langchain-community==0.0.10
 python-magic==0.4.27
 zipfile38==0.0.3
 rarfile==4.1
-py7zr==0.20.5
+py7zr==1.0.0
 pypdf==3.17.0
 python-docx==0.8.11
 markdown==3.5

backend/requirements.txt

@@ -41,7 +41,7 @@ python-magic==0.4.27  # For file type detection
 aiofiles==23.2.1  # Async file operations
 zipfile38==0.0.3  # Enhanced ZIP handling
 rarfile==4.1  # RAR support
-py7zr==0.20.5  # 7zip support
+py7zr==1.0.0  # 7zip support
 
 # === Document Processing ===
 pypdf==3.17.0  # PDF processing