fix: remove last-provider deletion restriction for OMO/OMO Slim plugins

OMO and OMO Slim are OpenCode plugins, not standalone apps — users
should be able to fully remove them. Remove the count-based guard that
prevented deleting the last active provider, and clean up the now-unused
provider-count API surface across the full stack.

src-tauri/src/commands/omo.rs

@@ -36,19 +36,6 @@ pub async fn disable_current_omo(state: State<'_, AppState>) -> Result<(), Strin
     Ok(())
 }
 
-#[tauri::command]
-pub async fn get_omo_provider_count(state: State<'_, AppState>) -> Result<usize, String> {
-    let providers = state
-        .db
-        .get_all_providers("opencode")
-        .map_err(|e| e.to_string())?;
-    let count = providers
-        .values()
-        .filter(|p| p.category.as_deref() == Some("omo"))
-        .count();
-    Ok(count)
-}
-
 // ── OMO Slim commands ───────────────────────────────────────
 
 #[tauri::command]
@@ -84,16 +71,3 @@ pub async fn disable_current_omo_slim(state: State<'_, AppState>) -> Result<(),
     OmoService::delete_config_file(&SLIM).map_err(|e| e.to_string())?;
     Ok(())
 }
-
-#[tauri::command]
-pub async fn get_omo_slim_provider_count(state: State<'_, AppState>) -> Result<usize, String> {
-    let providers = state
-        .db
-        .get_all_providers("opencode")
-        .map_err(|e| e.to_string())?;
-    let count = providers
-        .values()
-        .filter(|p| p.category.as_deref() == Some("omo-slim"))
-        .count();
-    Ok(count)
-}

src-tauri/src/lib.rs

@@ -1035,11 +1035,9 @@ pub fn run() {
             commands::set_window_theme,
             commands::read_omo_local_file,
             commands::get_current_omo_provider_id,
-            commands::get_omo_provider_count,
             commands::disable_current_omo,
             commands::read_omo_slim_local_file,
             commands::get_current_omo_slim_provider_id,
-            commands::get_omo_slim_provider_count,
             commands::disable_current_omo_slim,
             // Workspace files (OpenClaw)
             commands::read_workspace_file,

src-tauri/src/services/provider/mod.rs

@@ -260,18 +260,6 @@ impl ProviderService {
                         state
                             .db
                             .is_omo_provider_current(app_type.as_str(), id, "omo")?;
-                    let omo_count = state
-                        .db
-                        .get_all_providers(app_type.as_str())?
-                        .values()
-                        .filter(|p| p.category.as_deref() == Some("omo"))
-                        .count();
-
-                    if omo_count <= 1 && was_current {
-                        return Err(AppError::Message(
-                            "无法删除当前启用的最后一个 OMO 配置，请先停用".to_string(),
-                        ));
-                    }
 
                     state.db.delete_provider(app_type.as_str(), id)?;
                     if was_current {
@@ -287,18 +275,6 @@ impl ProviderService {
                         state
                             .db
                             .is_omo_provider_current(app_type.as_str(), id, "omo-slim")?;
-                    let slim_count = state
-                        .db
-                        .get_all_providers(app_type.as_str())?
-                        .values()
-                        .filter(|p| p.category.as_deref() == Some("omo-slim"))
-                        .count();
-
-                    if slim_count <= 1 && was_current {
-                        return Err(AppError::Message(
-                            "无法删除当前启用的最后一个 OMO Slim 配置，请先停用".to_string(),
-                        ));
-                    }
 
                     state.db.delete_provider(app_type.as_str(), id)?;
                     if was_current {