refactor: replace custom snake case macro with strum implementation

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

Cargo.toml

@@ -61,8 +61,6 @@ utoipa-swagger-ui = { version = "9.0.2", features = ["axum"] }
 uzers = "0.12.1"
 which = "8.0.0"
 xdg = "2.5.2"
-to_snake_case_string = { path = "./macros" }
-to_snake_case_trait = { path = "./to_snake_case_trait" }
 
 [dev-dependencies]
 tempfile = "3.3.0"

src/meta_plugin/mod.rs

@@ -117,7 +117,7 @@ impl MetaPlugin for BaseMetaPlugin {
     }
 }
 
-#[derive(Debug, Eq, PartialEq, Clone, strum::EnumIter, strum::Display, strum::EnumString)]
+#[derive(Debug, Eq, PartialEq, Clone, strum::EnumIter, strum::Display, strum::EnumString, strum::ToString)]
 #[strum(serialize_all = "snake_case", ascii_case_insensitive)]
 pub enum MetaPluginType {
     FileMagic,