feat(omo): integrate Oh My OpenCode profile management (#972)

* feat(omo): integrate Oh My OpenCode profile management into Provider system

Adds full-stack OMO support: backend config read/write/import, OMO-specific
provider CRUD with exclusive switching, frontend profile editor with
agent/category/model configuration, global config management, and i18n support.

* feat(omo): add model/variant dropdowns from enabled providers

Replace model text inputs with Select dropdowns sourced from enabled
OpenCode providers, add thinking-level variant selection, and prevent
auto-enabling newly added OMO providers.

* fix(omo): use standard provider action styles for OMO switch button

* fix(omo): replace hardcoded isZh strings with proper i18n t() calls

src-tauri/src/services/mod.rs

@@ -2,6 +2,7 @@ pub mod config;
 pub mod env_checker;
 pub mod env_manager;
 pub mod mcp;
+pub mod omo;
 pub mod prompt;
 pub mod provider;
 pub mod proxy;
@@ -12,6 +13,7 @@ pub mod usage_stats;
 
 pub use config::ConfigService;
 pub use mcp::McpService;
+pub use omo::OmoService;
 pub use prompt::PromptService;
 pub use provider::{ProviderService, ProviderSortUpdate};
 pub use proxy::ProxyService;