🔧 Fix binary file issue: Remove db files and update .dockerignore

- Remove backend/datasets/db/agent_monitoring.db
- Add database file exclusions to .dockerignore
- Ready for HF Spaces deployment

.dockerignore

@@ -157,4 +157,8 @@ test_*.json
 example*.json
 
 # Rule-based method data (too large for Git)
-agentgraph/methods/rule-based/
+agentgraph/methods/rule-based/# Database files
+*.db
+*.sqlite*
+db/
+datasets/db/