🔧 Fix SSL certificate config: Add #[serde(untagged)] to CertificateConfig enum

- Fixes TOML parsing error for SSL certificates
- Enables inline table format: Local = { certificate_path = "...", private_key_path = "..." }
- Resolves "enum table must contain exactly one table" error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: ismoilovdevml

src/configuration.rs

@@ -533,6 +533,7 @@ impl TryFrom<(String, Value)> for Box<dyn Middleware> {
 }
 
 #[derive(Debug, Deserialize)]
+#[serde(untagged)]
 pub enum CertificateConfig {
     Local {
         certificate_path: String,