refactor(util): move response helper to common/response and session logic to oauth

- Relocated generic HTTP response helpers (Response, OK, Err, etc.) from internal/util/ to a dedicated internal/common/response/ package.
- Renamed ResponseAny to Any to resolve revive stuttering warnings.
- Moved session building options and cookie headers logic from internal/util/ to internal/apps/oauth/.
- Removed all direct imports of Gin/Sessions/HTTP frameworks from internal/util/ to keep general utilities 100% pure.
- Regenerated Swagger API documentation via make swagger.
- All tests and make code-check compile and pass with 0 issues.

internal/apps/custom/routers.go

@@ -4,20 +4,19 @@
 // Package custom provides custom business handlers
 package custom
 
-import (
-	"net/http"
+import ("net/http"
 
-	"github.com/Rain-kl/Wavelet/internal/util"
 	"github.com/gin-gonic/gin"
-)
+
+	"github.com/Rain-kl/Wavelet/internal/common/response")
 
 // Hello is a sample handler for custom business logic
 // @Summary Sample Hello API
 // @Description A sample business API for customization
 // @Tags custom
 // @Produce json
-// @Success 200 {object} util.ResponseAny{data=string} "成功"
+// @Success 200 {object} response.Any{data=string} "成功"
 // @Router /api/v1/custom/hello [get]
 func Hello(c *gin.Context) {
-	c.JSON(http.StatusOK, util.OK("Hello from custom business module!"))
+	c.JSON(http.StatusOK, response.OK("Hello from custom business module!"))
 }