Coverage priorities 1-5: test pure functions, extract interfaces, mock-based handler tests

- Priority 1: Test NewSendEmailTask + NewSendPushTask (5 tests)
- Priority 2: Test customHTTPErrorHandler — all 15+ branches (21 tests)
- Priority 3: Extract Enqueuer interface + payload builders in worker pkg (5 tests)
- Priority 4: Extract ClassifyFile/ComputeRelPath in migrate-encrypt (6 tests)
- Priority 5: Define Handler interfaces, refactor to accept them, mock-based tests (14 tests)
- Fix .gitignore: /worker instead of worker to stop ignoring internal/worker/

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

internal/repositories/util_test.go

@@ -0,0 +1,29 @@
+package repositories
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestEscapeLikeWildcards(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		expected string
+	}{
+		{"no wildcards", "hello", "hello"},
+		{"percent sign", "50% off", "50\\% off"},
+		{"underscore", "user_name", "user\\_name"},
+		{"both wildcards", "50%_off", "50\\%\\_off"},
+		{"empty string", "", ""},
+		{"only wildcards", "%_", "\\%\\_"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := escapeLikeWildcards(tt.input)
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}