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/database/dao/mod.rs

@@ -4,6 +4,7 @@
 
 pub mod failover;
 pub mod mcp;
+pub mod omo;
 pub mod prompts;
 pub mod providers;
 pub mod proxy;
@@ -15,3 +16,4 @@ pub mod universal_providers;
 // 所有 DAO 方法都通过 Database impl 提供，无需单独导出
 // 导出 FailoverQueueItem 供外部使用
 pub use failover::FailoverQueueItem;
+pub use omo::OmoGlobalConfig;