docs(sync): create AI Instructions Synchronization Guide and update CLAUDE.md references

- Added a new document, `.AI_INSTRUCTIONS_SYNC.md`, detailing the organization and synchronization of AI instructions across CLAUDE.md and .cursor/rules/.
- Updated CLAUDE.md to include a note for AI assistants directing them to the new synchronization guide and emphasizing the importance of maintaining consistency.
- Enhanced `.cursor/rules/cursor_rules.mdc`, `README.mdc`, and other related files with cross-references to the synchronization guide for better clarity on maintaining documentation consistency.

.cursor/rules/README.mdc

@@ -9,6 +9,10 @@ alwaysApply: false
 
 This comprehensive set of Cursor Rules provides deep insights into **Coolify**, an open-source self-hostable alternative to Heroku/Netlify/Vercel. These rules will help you understand, navigate, and contribute to this complex Laravel-based deployment platform.
 
+> **Cross-Reference**: This directory is for **detailed, topic-specific rules** used by Cursor IDE and other AI assistants. For Claude Code specifically, also see **[CLAUDE.md](mdc:CLAUDE.md)** which provides a condensed, workflow-focused guide. Both systems share core principles but are optimized for their respective tools.
+>
+> **Maintaining Rules**: When updating these rules, see **[.AI_INSTRUCTIONS_SYNC.md](mdc:.AI_INSTRUCTIONS_SYNC.md)** for synchronization guidelines to keep CLAUDE.md and .cursor/rules/ consistent.
+
 ## Rule Categories
 
 ### 🏗️ Architecture & Foundation
@@ -71,7 +75,7 @@ Coolify uses a **team-based multi-tenancy** model where:
 - **Multi-server** support with SSH connections
 
 ### 3. Technology Stack
-- **Backend**: Laravel 11 + PHP 8.4
+- **Backend**: Laravel 12 + PHP 8.4
 - **Frontend**: Livewire 3.5 + Alpine.js + Tailwind CSS 4.1
 - **Database**: PostgreSQL 15 + Redis 7
 - **Containerization**: Docker + Docker Compose

.cursor/rules/cursor_rules.mdc

@@ -4,6 +4,12 @@ globs: .cursor/rules/*.mdc
 alwaysApply: true
 ---
 
+# Cursor Rules Maintenance Guide
+
+> **Important**: These rules in `.cursor/rules/` are shared between Cursor IDE and other AI assistants. Changes here should be reflected in **[CLAUDE.md](mdc:CLAUDE.md)** when they affect core workflows or patterns.
+>
+> **Synchronization Guide**: See **[.AI_INSTRUCTIONS_SYNC.md](mdc:.AI_INSTRUCTIONS_SYNC.md)** for detailed guidelines on maintaining consistency between CLAUDE.md and .cursor/rules/.
+
 - **Required Rule Structure:**
   ```markdown
   ---

.cursor/rules/laravel-boost.mdc

@@ -185,7 +185,7 @@ protected function isAccessible(User $user, ?string $path = null): bool
 
 ### Database
 - When modifying a column, the migration must include all of the attributes that were previously defined on the column. Otherwise, they will be dropped and lost.
-- Laravel 11 allows limiting eagerly loaded records natively, without external packages: `$query->latest()->limit(10);`.
+- Laravel 12 allows limiting eagerly loaded records natively, without external packages: `$query->latest()->limit(10);`.
 
 ### Models
 - Casts can and likely should be set in a `casts()` method on a model rather than the `$casts` property. Follow existing conventions from other models.

.cursor/rules/testing-patterns.mdc

@@ -5,6 +5,8 @@ alwaysApply: false
 ---
 # Coolify Testing Architecture & Patterns
 
+> **Cross-Reference**: These detailed testing patterns align with the testing guidelines in **[CLAUDE.md](mdc:CLAUDE.md)**. Both documents share the same core principles about Docker execution and mocking preferences.
+
 ## Testing Philosophy
 
 Coolify employs **comprehensive testing strategies** using modern PHP testing frameworks to ensure reliability of deployment operations, infrastructure management, and user interactions.