Refactor handlers and OpenAPI documentation for improved readability and consistency

- Reorganized imports in health, notifications, social, thoughts, and users handlers for clarity.
- Updated function signatures in handlers to improve readability by aligning parameters.
- Enhanced JSON response formatting in notifications and thoughts handlers.
- Improved error handling in user-related functions.
- Refactored OpenAPI documentation to maintain consistent formatting and structure.
- Cleaned up unnecessary code and comments across various files.
- Ensured consistent use of `Arc` for shared state in AppState and WorkerHandlers.

crates/domain/src/models/feed.rs

@@ -1,4 +1,4 @@
-use crate::models::{user::User, thought::Thought};
+use crate::models::{thought::Thought, user::User};
 use crate::value_objects::UserId;
 
 #[derive(Debug, Clone)]
@@ -25,10 +25,17 @@ pub struct FeedEntry {
 }
 
 #[derive(Debug, Clone)]
-pub struct PageParams { pub page: u64, pub per_page: u64 }
+pub struct PageParams {
+    pub page: u64,
+    pub per_page: u64,
+}
 impl PageParams {
-    pub fn offset(&self) -> i64 { ((self.page.saturating_sub(1)) * self.per_page) as i64 }
-    pub fn limit(&self) -> i64 { self.per_page as i64 }
+    pub fn offset(&self) -> i64 {
+        ((self.page.saturating_sub(1)) * self.per_page) as i64
+    }
+    pub fn limit(&self) -> i64 {
+        self.per_page as i64
+    }
 }
 
 #[derive(Debug, Clone)]