feat: add tenant and user management with migrations, handlers, and tests

- Implemented tenant and user management features including:
  - Tenant creation and management with associated migrations.
  - User creation and management with associated migrations.
  - Tenant membership management with associated migrations.
  - Platform user roles management with associated migrations.
  - Quota management with associated migrations.
  - Article and template management with associated migrations.
- Added HTTP handlers for templates and workspaces.
- Created tests for protected and public routes.
- Introduced a script to check tenant scope in SQL queries.
- Documented task plan for backend completion and frontend foundation.

server/internal/tenant/repository/common.go

@@ -0,0 +1,64 @@
+package repository
+
+import (
+	"time"
+
+	"github.com/jackc/pgx/v5/pgtype"
+
+	"github.com/geo-platform/tenant-api/internal/tenant/repository/generated"
+)
+
+func newQuerier(db generated.DBTX) generated.Querier {
+	return generated.New(db)
+}
+
+func nullableText(value pgtype.Text) *string {
+	if !value.Valid {
+		return nil
+	}
+	text := value.String
+	return &text
+}
+
+func nullableInt64(value pgtype.Int8) *int64 {
+	if !value.Valid {
+		return nil
+	}
+	number := value.Int64
+	return &number
+}
+
+func intFromInt4(value pgtype.Int4) int {
+	if !value.Valid {
+		return 0
+	}
+	return int(value.Int32)
+}
+
+func timeFromTimestamp(value pgtype.Timestamptz) time.Time {
+	if !value.Valid {
+		return time.Time{}
+	}
+	return value.Time
+}
+
+func pgText(value *string) pgtype.Text {
+	if value == nil {
+		return pgtype.Text{}
+	}
+	return pgtype.Text{String: *value, Valid: true}
+}
+
+func pgInt8(value *int64) pgtype.Int8 {
+	if value == nil {
+		return pgtype.Int8{}
+	}
+	return pgtype.Int8{Int64: *value, Valid: true}
+}
+
+func pgTimestamp(value *time.Time) pgtype.Timestamptz {
+	if value == nil {
+		return pgtype.Timestamptz{}
+	}
+	return pgtype.Timestamptz{Time: *value, Valid: true}
+}