refactor: separate API and SPA handling in server routes and add static file serving options
test: add tests for SPA handling and static file serving
feat: implement embedded SPA support for production and development environments
- Updated multiple repository and service files to replace imports from "github.com/mlogclub/simple/web/params" with "cs-agent/internal/pkg/httpx/params".
- Adjusted context handling in auth_service and ws_service to use gin.Context instead of iris.Context.
- Ensured consistent usage of HTTP status responses across websocket handlers.
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