Add .gitignore to prevent sensitive files from being committed

.gitignore

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+# ============================================================================
+# .gitignore - Komodo Stacks
+# Prevents sensitive files from being committed
+# ============================================================================
+
+# Secret/Environment files
+*.env
+*.env.*
+.env.local
+.env.*.local
+*.secrets
+*.secret
+
+# Backup files
+*.cfg.backup*
+*.backup*
+*.bak
+*.old
+*~
+
+# Local config (should NOT be committed)
+local.toml
+local.yml
+local.yaml
+config.local.*
+
+# IDE / Editor
+.vscode/
+.idea/
+*.swp
+*.swo
+*.tmp
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+logs/
+
+# Temporary files
+tmp/
+temp/
+*.tmp
+
+# Credentials
+credentials.json
+credentials.yaml
+credentials.toml
+auth.json
+
+# Keys
+*.pem
+*.key
+*.p12
+*.pfx
+
+# ============================================================================
+# SECURITY: Never commit these!
+# ============================================================================
+# - Tokens / API Keys
+# - Passwords
+# - Private keys
+# - .git/config (contains remote URLs with credentials)
+# - Any file with "secret", "token", "password", "credential" in name
+# - Database dumps
+# ============================================================================