Exit with non-zero code when no files are found to lint/format

[Copilot]

Previously, djLint would print "No files to check! 😢" but exit with code 0 (success) when no files were found to process. This allowed CI systems to silently miss configuration issues where djLint wasn't processing any files, potentially hiding problems for months.

Now djLint exits with code 1 when no files are found, making it easier to catch configuration issues in CI/CD pipelines.

Use Cases

# These now exit with code 1 when no HTML files are found
djlint --check jinja_templates/
djlint --lint jinja_templates/ 
djlint --reformat empty_directory/

Implementation

The change is minimal and surgical - only one line modified in src/djlint/__init__.py:

• Changed return to sys.exit(1) when the file list is empty
• Preserves existing user-friendly message "No files to check! 😢"
• Works consistently across all djLint modes (--lint, --check, --reformat)

Edge Cases Handled

• Stdin input: Still works normally (exit code 0) since it creates a temporary file
• Nonexistent paths: Handled by Click's path validation before our code runs
• Directories with files: Normal operation unchanged (exit code 0 when files found)

Fixes #1112.

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