fix(persistence): migrate all pkg/persistence imports to plugins/infra/database and plugins/infra/cache

- Replace db.DB(ctx) with database.DB(ctx) from plugins/infra/database
- Replace db.Redis/db.PrefixedKey/db.GetJSON/db.SetJSON with cachepkg.* from plugins/infra/cache
- Replace pkg/persistence/idgen with pkg/idgen (already exists)
- Replace pkg/persistence/batchwriter with pkg/batchwriter (already exists)
- Replace pkg/persistence/migrator with pkg/migrator (already exists)
- Replace pkg/persistence/logstore with plugins/domain/risk_control/logstore
- Delete defunct pkg/{persistence,cap,message_gateway,push,shared,task}
- Fix vet issues: db alias in domain_test.go, driver_asynq_worker.TaskHandler reference
- Update Makefile architecture guard
- Update docs and skill references
- Update go.mod: gorilla/sessions promotion to direct dependency

plugins/domain/cap/handlers.go

@@ -6,14 +6,14 @@ package cap
 import (
 	"net/http"
 
-	pkgcap "github.com/Rain-kl/Wavelet/pkg/cap"
 	"github.com/Rain-kl/Wavelet/pkg/logger"
 	"github.com/Rain-kl/Wavelet/pkg/response"
+	"github.com/Rain-kl/Wavelet/plugins/domain/cap/pow"
 	"github.com/gin-gonic/gin"
 )
 
-// ChallengeResponse is a local type alias for the pkg/cap.ChallengeResponse struct
-type ChallengeResponse = pkgcap.ChallengeResponse
+// ChallengeResponse is a local type alias for the pow.ChallengeResponse struct
+type ChallengeResponse = pow.ChallengeResponse
 
 type challengeRequest struct {
 	Scope string `json:"scope" form:"scope"`