fix: resolve Makefile duplicate install target and Celery deprecation warning

- Rename second 'install' target to 'platform-install' to avoid conflict
- Add broker_connection_retry_on_startup=True for Celery 6.0 compatibility
- Update install.py references to use 'make platform-install'

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Makefile

@@ -123,7 +123,7 @@ init-prod:
 	@echo "✨ Platform is ready for production OR development"
 
 # First-time installation - Complete setup with configuration validation
-install:
+platform-install:
 	@echo "🚀 WIZAMART PLATFORM INSTALLATION"
 	@echo "=================================="
 	$(PYTHON) scripts/install.py

app/core/celery_config.py

@@ -43,6 +43,8 @@ celery_app.conf.update(
     # Timezone
     timezone="Europe/Luxembourg",
     enable_utc=True,
+    # Broker connection
+    broker_connection_retry_on_startup=True,  # Retry connection on startup (Celery 6.0+)
     # Task behavior
     task_track_started=True,
     task_time_limit=30 * 60,  # 30 minutes hard limit

scripts/install.py

@@ -11,7 +11,7 @@ This script handles first-time installation of the Wizamart platform:
 6. Provides a configuration status report
 
 Usage:
-    make install
+    make platform-install
     # or directly:
     python scripts/install.py
 
@@ -572,7 +572,7 @@ def main():
 
     if warning_count > 0 or missing_count > 0:
         print("  2. Update .env with production values")
-        print("  3. Run 'make install' again to verify")
+        print("  3. Run 'make platform-install' again to verify")
     else:
         print("  2. Start the application: make dev")