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/api-types/src/requests.rs

@@ -1,6 +1,10 @@
 use serde::Deserialize;
 use uuid::Uuid;
 
+pub const DEFAULT_PAGE: u64 = 1;
+pub const DEFAULT_PER_PAGE: u64 = 20;
+pub const MAX_PER_PAGE: u64 = 100;
+
 #[derive(Deserialize, utoipa::ToSchema)]
 #[serde(rename_all = "camelCase")]
 pub struct RegisterRequest {
@@ -66,11 +70,11 @@ pub struct PaginationQuery {
 
 impl PaginationQuery {
     pub fn page(&self) -> u64 {
-        self.page.unwrap_or(1).max(1)
+        self.page.unwrap_or(DEFAULT_PAGE).max(DEFAULT_PAGE)
     }
 
     pub fn per_page(&self) -> u64 {
-        self.per_page.unwrap_or(20).min(100)
+        self.per_page.unwrap_or(DEFAULT_PER_PAGE).min(MAX_PER_PAGE)
     }
 }