Add organization/site/tags support for machine grouping

- Added organization, site, tags columns to connect_machines table
- Agent now sends org/site/tags from embedded config in AgentStatus
- Server stores org/site/tags metadata in database
- Enables grouping machines by client/site/tag in dashboard

agent/src/session/mod.rs

@@ -175,6 +175,9 @@ impl SessionManager {
             display_count: self.get_display_count(),
             is_streaming: self.state == SessionState::Streaming,
             agent_version: crate::build_info::short_version(),
+            organization: self.config.company.clone().unwrap_or_default(),
+            site: self.config.site.clone().unwrap_or_default(),
+            tags: self.config.tags.clone(),
         };
 
         let msg = Message {