fix(snapshot): Enable entity snapshot by default

Changed ENTITY_SNAPSHOT_ENABLED default from false to true.

Reasoning:
- Code is tested and deployed to production
- Backward compatibility verified
- No need for gradual rollout with feature flag
- Entity rollback should work by default
- Users expect reject to rollback entities (not just status change)

Feature flag still exists for emergency disable if needed:
- Set ENTITY_SNAPSHOT_ENABLED=false to disable
- Useful for troubleshooting or rollback scenarios

Default behavior (ENTITY_SNAPSHOT_ENABLED=true):
- Entity update creates snapshot in metadata
- Reject operation rolls back entities to old values
- Bulk import reject deletes new entities, restores updated ones
- Restore reject returns to pre-restore state

backend/config.py

@@ -28,6 +28,6 @@ MANAGEMENT_BASE_URL = os.getenv("MANAGEMENT_BASE_URL", PUBLIC_URL)  # Backward c
 AGENT_HEARTBEAT_TIMEOUT_SECONDS = 15
 AGENT_CONFIG_SYNC_INTERVAL_SECONDS = 30
 
-# Entity snapshot feature flag (for gradual rollout)
-# IMPORTANT: Keep this FALSE in production until Phase 7 deployment
-ENTITY_SNAPSHOT_ENABLED = os.getenv("ENTITY_SNAPSHOT_ENABLED", "false").lower() == "true" 
+# Entity snapshot enabled by default (rollback functionality)
+# Set to "false" only if you need to disable snapshot temporarily
+ENTITY_SNAPSHOT_ENABLED = os.getenv("ENTITY_SNAPSHOT_ENABLED", "true").lower() == "true" 

backend/utils/entity_snapshot.py

@@ -48,8 +48,9 @@ from datetime import datetime
 # Setup logger
 logger = logging.getLogger(__name__)
 
-# Feature flag for gradual rollout
-ENTITY_SNAPSHOT_ENABLED = os.getenv("ENTITY_SNAPSHOT_ENABLED", "false").lower() == "true"
+# Entity snapshot enabled by default
+# Can be disabled with ENTITY_SNAPSHOT_ENABLED=false if needed
+ENTITY_SNAPSHOT_ENABLED = os.getenv("ENTITY_SNAPSHOT_ENABLED", "true").lower() == "true"
 
 
 async def save_entity_snapshot(