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/adapters/postgres/src/remote_actor_connections.rs

@@ -1,3 +1,4 @@
+use crate::db_error::IntoDbResult;
 use async_trait::async_trait;
 use domain::{
     errors::DomainError, models::actor_connection_summary::ActorConnectionSummary,
@@ -46,7 +47,7 @@ impl RemoteActorConnectionRepository for PgRemoteActorConnectionRepository {
             .bind(&actor.avatar_url)
             .execute(&self.pool)
             .await
-            .map_err(|e| DomainError::Internal(e.to_string()))?;
+            .into_domain()?;
         }
         Ok(())
     }
@@ -75,7 +76,7 @@ impl RemoteActorConnectionRepository for PgRemoteActorConnectionRepository {
         .bind(page as i32)
         .fetch_all(&self.pool)
         .await
-        .map_err(|e| DomainError::Internal(e.to_string()))?;
+        .into_domain()?;
 
         Ok(rows
             .into_iter()
@@ -103,7 +104,7 @@ impl RemoteActorConnectionRepository for PgRemoteActorConnectionRepository {
         .bind(page as i32)
         .fetch_optional(&self.pool)
         .await
-        .map_err(|e| DomainError::Internal(e.to_string()))?;
+        .into_domain()?;
 
         Ok(row.and_then(|(ts,)| ts))
     }