feat(omo): add OMO Slim (oh-my-opencode-slim) support

Implement full OMO Slim profile management to align with ai-toolbox:
- Backend: Slim service methods, DAO, Tauri commands, plugin conflict handling
- Frontend: types, API, query hooks, form integration with isSlim parameterization
- Slim variant: 6 agents (no categories), separate config file and plugin name
- Mutual exclusion: standard OMO and Slim cannot coexist as plugins
- i18n: zh/en/ja translations for all Slim agent descriptions

src-tauri/src/opencode_config.rs

@@ -145,14 +145,25 @@ pub fn add_plugin(plugin_name: &str) -> Result<(), AppError> {
 
     match plugins {
         Some(arr) => {
+            // Mutual exclusion: standard OMO and OMO Slim cannot coexist as plugins
             if plugin_name.starts_with("oh-my-opencode")
                 && !plugin_name.starts_with("oh-my-opencode-slim")
             {
+                // Adding standard OMO -> remove all Slim variants
                 arr.retain(|v| {
                     v.as_str()
                         .map(|s| !s.starts_with("oh-my-opencode-slim"))
                         .unwrap_or(true)
                 });
+            } else if plugin_name.starts_with("oh-my-opencode-slim") {
+                // Adding Slim -> remove all standard OMO variants (but keep slim)
+                arr.retain(|v| {
+                    v.as_str()
+                        .map(|s| {
+                            !s.starts_with("oh-my-opencode") || s.starts_with("oh-my-opencode-slim")
+                        })
+                        .unwrap_or(true)
+                });
             }
 
             let already_exists = arr.iter().any(|v| v.as_str() == Some(plugin_name));