feat(core): sync framework security hardening and accessibility improvements

- add util.Go with panic recovery for background goroutines
- add util.EscapeLike and explicit ESCAPE clause for SQL LIKE queries
- add DummyCheckPassword and subtle.ConstantTimeCompare against timing attacks
- enforce session ID rotation upon login/oauth callback to prevent session fixation
- add sliding window login failure rate limiting and oauth state rate limiting
- fix redis client capture race in pubsub listeners and wait on stop channel
- adjust global --primary to oklch(51.1% 0.262 276.966) for WCAG AA contrast
- fix semantic heading levels and missing aria-labels across UI components
- document security, concurrency, and a11y standards in AGENTS.md

internal/apps/admin/updater/routers.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/Rain-kl/Wavelet/pkg/logger"
+	"github.com/Rain-kl/Wavelet/pkg/util"
 	"github.com/gin-gonic/gin"
 
 	"github.com/Rain-kl/Wavelet/internal/shared/response"
@@ -58,11 +59,11 @@ func ApplyUpdate(c *gin.Context) {
 	logger.InfoF(c.Request.Context(), "[Updater] upgrade prepared; restarting with %s", stagedBinary)
 	c.JSON(http.StatusOK, response.OKNil())
 
-	go func() {
+	util.Go(func() {
 		time.Sleep(time.Second)
 		if err := replaceAndRestart(executable, stagedBinary); err != nil {
 			defaultManager.finishUpgrade()
 			logger.ErrorF(context.Background(), "[Updater] replace and restart failed: %v", err)
 		}
-	}()
+	})
 }