Fix #1686: Docker health endpoint reports outdated version

[jose-blockchain]

Summary

Fixes #1686: Docker health endpoint reports outdated version (0.5.1-d1 instead of 0.8.0)

The /health endpoint in the Docker image was returning a hardcoded version string that wasn't updated when the image was rebuilt with newer crawl4ai versions. This change replaces the hardcoded value with a dynamic import from the installed package, ensuring the health endpoint always reports the correct version.

List of files changed and why

• deploy/docker/server.py - Replaced hardcoded __version__ = "0.5.1-d1" with dynamic import from crawl4ai.__version__ import __version__ to automatically sync with the installed package version

How Has This Been Tested?

• Verified the import syntax is correct and matches patterns used elsewhere in the codebase (e.g., async_webcrawler.py)
• Confirmed the health endpoint at line 602 uses the imported __version__ variable
• Checked that crawl4ai/__version__.py contains the current version (0.8.0)
• Validated no linting errors introduced
• The fix will be verified when the Docker image is rebuilt - the /health endpoint should then return the correct version instead of "0.5.1-d1"

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas (added comment explaining why version is imported)
• I have made corresponding changes to the documentation (not needed - this is a bug fix)
• I have added/updated unit tests that prove my fix is effective or that my feature works (not needed - this is a simple import change that will be verified in Docker build)
• New and existing unit tests pass locally with my changes (Docker-specific change, will be verified in container environment)

[jose-blockchain]

please review if still needed @chansearrington @abhilov23 @SohamKukreti , thanks!