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

server/src/db/machines.rs

@@ -116,3 +116,34 @@ pub async fn delete_machine(pool: &PgPool, agent_id: &str) -> Result<(), sqlx::E
         .await?;
     Ok(())
 }
+
+/// Update machine organization, site, and tags
+pub async fn update_machine_metadata(
+    pool: &PgPool,
+    agent_id: &str,
+    organization: Option<&str>,
+    site: Option<&str>,
+    tags: &[String],
+) -> Result<(), sqlx::Error> {
+    // Only update if at least one value is provided
+    if organization.is_none() && site.is_none() && tags.is_empty() {
+        return Ok(());
+    }
+
+    sqlx::query(
+        r#"
+        UPDATE connect_machines SET
+            organization = COALESCE($1, organization),
+            site = COALESCE($2, site),
+            tags = CASE WHEN $3::text[] = '{}' THEN tags ELSE $3 END
+        WHERE agent_id = $4
+        "#,
+    )
+    .bind(organization)
+    .bind(site)
+    .bind(tags)
+    .bind(agent_id)
+    .execute(pool)
+    .await?;
+    Ok(())
+}