🔧 Use internal tagging for CertificateConfig enum

- Add #[serde(tag = "type")] for better TOML compatibility
- TOML format:  with = not found
Local not found field
- Fixes enum deserialization error

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

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ismoilovdevml

src/configuration.rs

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