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/infra/cache/plugin.go

@@ -14,7 +14,6 @@ import (
 	"github.com/Rain-kl/Wavelet/core"
 	"github.com/Rain-kl/Wavelet/core/contracts"
 	"github.com/Rain-kl/Wavelet/pkg/cache/ram"
-	"github.com/Rain-kl/Wavelet/pkg/persistence"
 	"github.com/Rain-kl/Wavelet/pkg/util"
 	"github.com/redis/go-redis/v9"
 )
@@ -82,7 +81,7 @@ func (p *Plugin) Name() string {
 func (p *Plugin) Apply(ctx *core.Context) error {
 	redisClient := p.redisClient
 	if redisClient == nil {
-		redisClient = db.Redis
+		redisClient = Redis
 	}
 
 	ramCache, err := ram.New[string, ramEntry](ram.Options{
@@ -128,7 +127,7 @@ func (s *cacheServiceImpl) prefixedKey(key string) string {
 	if s.keyPrefix != "" {
 		return s.keyPrefix + key
 	}
-	return db.PrefixedKey(key)
+	return PrefixedKey(key)
 }
 
 func (s *cacheServiceImpl) startPubSubListener() {