Refactor database error handling across repositories to use IntoDbResult for improved error management

- Updated PgNotificationRepository to utilize IntoDbResult for error handling in various methods.
- Refactored PgRemoteActorRepository to replace manual error mapping with IntoDbResult.
- Modified PgRemoteActorConnectionRepository to implement IntoDbResult for error handling.
- Adjusted PgTagRepository to use IntoDbResult for consistent error management.
- Introduced test_helpers module for seeding users and thoughts in tests.
- Enhanced PgThoughtRepository to leverage IntoDbResult for error handling.
- Updated PgTopFriendRepository to utilize IntoDbResult for error management.
- Refactored PgUserRepository to implement IntoDbResult for error handling.
- Added constants for pagination defaults in requests.
- Introduced MAX_TOP_FRIENDS constant for top friends validation.
- Refactored JWT expiration time to use a constant.
- Improved rate limiter configuration with constants for better readability.
- Added utility methods for FollowState and Visibility enums for string conversions.
- Introduced maximum length constants for Username, Email, and Content value objects.
- Cleaned up test modules by removing redundant code and utilizing a shared testing state.

crates/bootstrap/src/factory.rs

@@ -1,3 +1,5 @@
+const JWT_TTL_SECS: i64 = 86_400 * 30;
+
 use async_trait::async_trait;
 use sqlx::PgPool;
 use std::sync::Arc;
@@ -107,7 +109,7 @@ pub async fn build(cfg: &Config) -> Infrastructure {
         search: Arc::new(postgres_search::PgSearchRepository::new(pool.clone())),
         auth: Arc::new(auth::JwtAuthService::new(
             cfg.jwt_secret.clone(),
-            86400 * 30,
+            JWT_TTL_SECS,
         )),
         hasher: Arc::new(auth::Argon2PasswordHasher),
         events: event_publisher,