fix: update links to OAuth implementation guides for consistency

Author: Lasim

docs/development/backend/api-security.mdx

@@ -179,7 +179,7 @@ fastify.get('/dual-auth-endpoint', {
 });
 ```
 
-For detailed OAuth2 implementation, see the [Backend OAuth Implementation Guide](/development/backend/oauth) and [Backend Security Policy](/development/backend/security#oauth2-server-security).
+For detailed OAuth2 implementation, see the [Backend OAuth Implementation Guide](/development/backend/oauth-providers) and [Backend Security Policy](/development/backend/security#oauth2-server-security).
 
 ### Team-Aware Permission System
 

docs/development/backend/oauth2-server.mdx

@@ -5,7 +5,7 @@ description: Developer guide for the OAuth2 authorization server that enables pr
 
 # OAuth2 Server Implementation
 
-This document describes the OAuth2 authorization server implementation in the DeployStack backend, which enables CLI tools and applications to access APIs using Bearer tokens. For general authentication, see [Backend Authentication System](/development/backend/auth). For OAuth provider integration (social login), see [GitHub OAuth Implementation](/development/backend/github-oauth).
+This document describes the OAuth2 authorization server implementation in the DeployStack backend, which enables CLI tools and applications to access APIs using Bearer tokens. For general authentication, see [Backend Authentication System](/development/backend/auth). For OAuth provider integration (social login), see [Providers OAuth Implementation](/development/backend/oauth-providers).
 
 ## Overview
 

docs/development/backend/security.mdx

@@ -105,7 +105,7 @@ The OAuth2 server implementation follows RFC 6749 and RFC 7636 security standard
 - **Scope Enforcement:** Middleware validates required scopes per endpoint
 - **Dual Authentication:** Seamless support for both cookies and Bearer tokens
 
-For implementation details, see the [Backend OAuth Implementation Guide](/development/backend/oauth).
+For implementation details, see the [Backend OAuth Implementation Guide](/development/backend/oauth-providers).
 
 ## Dependencies
 

docs/development/gateway/oauth.mdx

@@ -190,7 +190,7 @@ The OAuth client adapts to different environments:
 
 ## Integration with Backend
 
-The gateway OAuth client integrates with the [backend OAuth2 server](/development/backend/oauth#oauth2-server-implementation):
+The gateway OAuth client integrates with the [backend OAuth2 server](/development/backend/oauth2-server):
 
 - **Client Registration**: Pre-registered with known client ID
 - **PKCE Support**: Uses SHA256 method as required by backend