refactor(structure): group platform, infra, and shared packages

Move process wiring, technical adapters, and cross-cutting contracts out of flat internal/ packages so new code has a clear home without changing business layout.

internal/repository/analytics/access_log.go

@@ -8,7 +8,7 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/Rain-kl/Wavelet/internal/db"
+	"github.com/Rain-kl/Wavelet/internal/infra/persistence"
 	analyticsmodel "github.com/Rain-kl/Wavelet/internal/model/analytics"
 	"gorm.io/gorm"
 )

internal/repository/analytics/access_log_stats.go

@@ -9,7 +9,7 @@ import (
 	"sort"
 	"time"
 
-	"github.com/Rain-kl/Wavelet/internal/db"
+	"github.com/Rain-kl/Wavelet/internal/infra/persistence"
 	analyticsmodel "github.com/Rain-kl/Wavelet/internal/model/analytics"
 )
 

internal/repository/analytics/access_log_test.go

@@ -10,7 +10,7 @@ import (
 
 	"github.com/ClickHouse/clickhouse-go/v2/lib/column"
 	"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
-	"github.com/Rain-kl/Wavelet/internal/db"
+	"github.com/Rain-kl/Wavelet/internal/infra/persistence"
 	analyticsmodel "github.com/Rain-kl/Wavelet/internal/model/analytics"
 	"github.com/glebarez/sqlite"
 	"github.com/stretchr/testify/assert"

internal/repository/analytics/access_log_writer.go

@@ -7,7 +7,7 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/Rain-kl/Wavelet/internal/db"
+	"github.com/Rain-kl/Wavelet/internal/infra/persistence"
 	analyticsmodel "github.com/Rain-kl/Wavelet/internal/model/analytics"
 )