chore: commit Cargo.lock for reproducible builds

For binary applications, Cargo.lock should be committed to ensure
reproducible builds. This fixes the Docker build in the release workflow.

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

Author: copyleftdev

.gitignore

@@ -1,7 +1,6 @@
 # Rust
 /target/
 **/*.rs.bk
-Cargo.lock
 
 # Python
 __pycache__/