Secret management with multiple backend support

This crate provides a unified interface for resolving secrets from various backends:

• OS Keychain (keychain://service/key): macOS Keychain, Windows Credential Manager, Linux Secret Service
• 1Password CLI (op://vault/item/field): Requires op CLI to be installed and authenticated
• Environment variables (env://VAR_NAME): Read from process environment
• Files (file:///path or just /path): Read content from filesystem
• Plain values: Any string without a URI scheme is treated as a literal value

Example

use siphon_secrets::{SecretUri, SecretResolver};

// Parse a secret URI from config
let uri: SecretUri = "keychain://myapp/api-token".parse()?;

// Resolve to actual value
let resolver = SecretResolver::new();
let secret = resolver.resolve(&uri)?;

Features

• keychain (default): Enable OS keychain support via keyring crate
• onepassword (default): Enable 1Password CLI support
• env (default): Enable environment variable support
• file (default): Enable file reading support