T1.5: Create src/storage; move store/paths logic

Move store.go, paths.go, and store_test.go from src/core into the new
src/storage package. Update src/scheduler and src/gui to import storage
instead of core for Store/Paths/OpenStore. Empty the moved files in core
to preserve the package declaration for the remaining core symbols.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/scheduler/scheduler.go

@@ -7,8 +7,8 @@ import (
 	"sync"
 	"time"
 
-	"gitea.mixdep.ru/mix/gosentry/src/core"
 	"gitea.mixdep.ru/mix/gosentry/src/domain"
+	"gitea.mixdep.ru/mix/gosentry/src/storage"
 	"gitea.mixdep.ru/mix/gosentry/src/runner"
 	"github.com/robfig/cron/v3"
 )
@@ -20,7 +20,7 @@ var cronParser = cron.NewParser(cron.Minute | cron.Hour | cron.Dom | cron.Month
 // this keeps the early architecture simple while storage and scheduling are
 // still in one desktop process.
 type Scheduler struct {
-	store    *core.Store
+	store    *storage.Store
 	jobs     *[]domain.Job
 	onChange func(domain.RunRecord)
 
@@ -30,7 +30,7 @@ type Scheduler struct {
 	paused bool
 }
 
-func NewScheduler(store *core.Store, jobs *[]domain.Job, onChange func(domain.RunRecord)) *Scheduler {
+func NewScheduler(store *storage.Store, jobs *[]domain.Job, onChange func(domain.RunRecord)) *Scheduler {
 	ctx, cancel := context.WithCancel(context.Background())
 	s := &Scheduler{
 		store:    store,