metrics + overview: stop counting utility accounts as members, and surface agent usage

The panel has always excluded operator/utility emails from member counts
(OPERATOR_EMAILS), but the metrics counted every row in the members table, so the
panel said 75 while every metric surface said 76. The one affected row is
info@inference.coop — the reading mailbox, not a person.

- metrics_snapshot.py now applies the same OPERATOR_EMAILS definition (same variable
  name, same default) so the two cannot drift apart again. No backfill: history stays
  as published and the daily job writes the corrected value going forward.
- admin_overview now also returns an `agents` list, built from the LiteLLM teams it
  already fetches (anything not member:*), so bot and sandbox spend is visible rather
  than structurally invisible. Kept out of member counts and member aggregates, like
  the operator category.

metrics_snapshot.py

@@ -143,21 +143,32 @@ def listmonk_joins() -> list[str] | None:
     return joins or None
 
 
+# Utility/operator accounts are not members. The panel has always excluded them
+# (OPERATOR_EMAILS in app/main.py) while the metrics counted every row, so the two
+# disagreed. Same variable name, same default, so they cannot drift apart again.
+OPERATOR_EMAILS = {
+    e.strip().lower()
+    for e in os.environ.get("OPERATOR_EMAILS", "info@inference.coop,bot@inference.coop").split(",")
+    if e.strip()
+}
+
+
 def from_sqlite() -> dict:
-    """Members, plus the provisioning dates that give the growth curve."""
+    """Members, plus the provisioning dates that give the growth curve.
+
+    Operator/utility accounts are excluded, matching the panel's member count.
+    """
     conn = connect()
     try:
-        active = conn.execute("SELECT COUNT(*) FROM members WHERE active=1").fetchone()[0]
-        total = conn.execute("SELECT COUNT(*) FROM members").fetchone()[0]
-        joins = [
-            row[0]
-            for row in conn.execute(
-                "SELECT welcome_sent_at FROM members WHERE welcome_sent_at IS NOT NULL AND welcome_sent_at != ''"
-            )
-        ]
+        rows = conn.execute("SELECT email, active, welcome_sent_at FROM members").fetchall()
     finally:
         conn.close()
-    return {"active": active, "total": total, "joins": joins}
+    real = [r for r in rows if (r[0] or "").strip().lower() not in OPERATOR_EMAILS]
+    return {
+        "active": sum(1 for r in real if r[1]),
+        "total": len(real),
+        "joins": [r[2] for r in real if r[2]],
+    }
 
 
 def from_listmonk() -> int | None: