Add refresh token authentication system

Implement complete refresh token flow for improved security:
- Short-lived access tokens (configurable, default 1h)
- Long-lived refresh tokens (configurable, default 7d)
- Automatic token rotation on refresh
- Token revocation for proper logout

Domain layer:
- Add RefreshToken entity with validation and revocation
- Add RefreshTokenRepository interface

Application layer:
- Add RefreshTokenHandler for token refresh operations
- Add RevokeTokenHandler for single token revocation
- Add RevokeAllTokensHandler for user-wide revocation

Infrastructure layer:
- Implement SQLite RefreshTokenRepository
- Add refresh_tokens table migration with indexes
- Add parseDuration helper for flexible time configuration

HTTP layer:
- Add POST /api/v1/auth/refresh endpoint
- Add POST /api/v1/auth/logout endpoint
- Update login/register to return refresh tokens
- Improve Swagger documentation with clear descriptions

Configuration:
- Update .env.example with secure token expiry defaults
- Add support for minute/hour/day duration formats

Tests:
- Fix test suite to work with new signatures
- All existing tests passing

internal/infrastructure/persistence/sqlite/habit_repository_test.go

@@ -23,6 +23,7 @@ func TestHabitRepositoryCreate(t *testing.T) {
 		value_objects.HabitTypeBoolean,
 		value_objects.FrequencyDaily,
 		false,
+		false,
 	)
 	habit.Description = "Exercise every morning"
 
@@ -49,6 +50,7 @@ func TestHabitRepositoryCreateWithSpecificDays(t *testing.T) {
 		value_objects.HabitTypeBoolean,
 		value_objects.FrequencyWeekly,
 		false,
+		false,
 	)
 	habit.SpecificDays = []int{1, 3, 5}
 
@@ -80,6 +82,7 @@ func TestHabitRepositoryFindByID(t *testing.T) {
 		value_objects.HabitTypeCounter,
 		value_objects.FrequencyDaily,
 		true,
+		false,
 	)
 	targetValue := 30.0
 	habit.TargetValue = &targetValue
@@ -165,6 +168,7 @@ func TestHabitRepositoryUpdate(t *testing.T) {
 		value_objects.HabitTypeBoolean,
 		value_objects.FrequencyDaily,
 		false,
+		false,
 	)
 
 	err := repo.Create(ctx, habit)
@@ -210,6 +214,7 @@ func TestHabitRepositoryUpdateNotFound(t *testing.T) {
 		value_objects.HabitTypeBoolean,
 		value_objects.FrequencyDaily,
 		false,
+		false,
 	)
 	habit.ID = "non-existent"
 
@@ -232,6 +237,7 @@ func TestHabitRepositoryArchive(t *testing.T) {
 		value_objects.HabitTypeBoolean,
 		value_objects.FrequencyDaily,
 		false,
+		false,
 	)
 
 	err := repo.Create(ctx, habit)