chore: Add package-lock.json files and comprehensive .gitignore

- Add package-lock.json for sync-coordinator and encryption-service to lock dependency versions
- Create comprehensive .gitignore to exclude node_modules, build artifacts, and sensitive files
- Ensures consistent dependency versions across environments

.gitignore

@@ -0,0 +1,98 @@
+# Node.js
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+dist/
+*.log
+
+# Gradle
+.gradle/
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+# Android
+*.apk
+*.ap_
+*.aab
+*.dex
+*.class
+local.properties
+.idea/
+*.iml
+*.ipr
+*.iws
+.DS_Store
+/captures
+.externalNativeBuild
+.cxx
+
+# Rust
+target/
+Cargo.lock
+**/*.rs.bk
+*.pdb
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+env/
+venv/
+ENV/
+.venv
+pip-log.txt
+pip-delete-this-directory.txt
+.pytest_cache/
+.coverage
+htmlcov/
+*.egg-info/
+dist/
+.eggs/
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.project
+.classpath
+.settings/
+
+# OS
+.DS_Store
+Thumbs.db
+*.log
+
+# Build outputs
+*.o
+*.lo
+*.so
+*.dylib
+*.dll
+*.exe
+*.out
+*.app
+
+# Temporary files
+*.tmp
+*.temp
+*.bak
+*.swp
+*~
+
+# Security
+*.key
+*.pem
+*.p12
+*.jks
+.env
+.env.local
+.env.*.local
+secrets/
+credentials/