refactor(workspace): pass workspace object instead of id to service methods

- Replace workspace_id parameter with Workspace object reference in all workspace service methods
- Remove redundant find_workspace_by_id calls that were duplicated in each method
- Update all method signatures across approval, audit, billing, branding, core, settings and stats modules
- Modify SQL queries to bind ws.id instead of separate workspace_id parameter
- Add Workspace import to all affected modules
- Adjust method calls in API handlers to pass workspace object instead of id
- Consolidate workspace retrieval logic to single location per operation flow

service/workspace/settings.rs

@@ -2,7 +2,7 @@ use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
 use crate::error::AppError;
-use crate::models::workspaces::WorkspaceSettings;
+use crate::models::workspaces::{Workspace, WorkspaceSettings};
 use crate::service::WorkspaceService;
 use crate::session::Session;
 
@@ -24,26 +24,24 @@ impl WorkspaceService {
     pub async fn workspace_settings(
         &self,
         ctx: &Session,
-        workspace_id: Uuid,
+        ws: &Workspace,
     ) -> Result<WorkspaceSettings, AppError> {
         let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
-        let ws = self.find_workspace_by_id(workspace_id).await?;
         self.ensure_workspace_readable(user_uid, &ws).await?;
-        self.ensure_user_workspace_settings(workspace_id).await
+        self.ensure_user_workspace_settings(ws.id).await
     }
 
     pub async fn workspace_update_settings(
         &self,
         ctx: &Session,
-        workspace_id: Uuid,
+        ws: &Workspace,
         params: UpdateWorkspaceSettingsParams,
     ) -> Result<WorkspaceSettings, AppError> {
         let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
-        let ws = self.find_workspace_by_id(workspace_id).await?;
         self.ensure_workspace_role_at_least(user_uid, &ws, crate::models::common::Role::Admin)
             .await?;
 
-        let current = self.ensure_user_workspace_settings(workspace_id).await?;
+        let current = self.ensure_user_workspace_settings(ws.id).await?;
         let now = chrono::Utc::now();
         let mut txn = self
             .ctx
@@ -77,7 +75,7 @@ impl WorkspaceService {
         .bind(params.pull_requests_enabled.unwrap_or(current.pull_requests_enabled))
         .bind(params.wiki_enabled.unwrap_or(current.wiki_enabled))
         .bind(now)
-        .bind(workspace_id)
+        .bind(ws.id)
         .fetch_one(&mut *txn)
         .await
         .map_err(AppError::Database)?;