chore: remove sensitive keys from version control

- Add .keys directory to .gitignore
- Remove tracked key files
- Add key generation instructions to README

Author: vveerrgg

.gitignore

@@ -9,11 +9,20 @@ dist/
 build/
 *.tsbuildinfo
 
+# Documentation
+docs/
+
 # Environment variables
 .env
 .env.local
 .env.*.local
 
+# Sensitive data
+.keys/
+*.key
+*.pem
+*.secret
+
 # IDE and editor files
 .idea/
 .vscode/