feat: integration/webhook counts in project overview

ProjectOverview gains integration_count + webhook_count (enabled only);
dashboard Resources list gets an Integrations row linking to the new
view. Covers the "dashboard widget if cheap" Phase 4 item.

Authored By: TDvorak <[email protected]>

apps/backend/internal/database/db/projects.sql.go

@@ -217,7 +217,18 @@ SELECT
     SELECT MAX(al.created_at)::TIMESTAMPTZ
     FROM core.audit_logs al
     WHERE al.project_id = p.id
-  ) AS last_audit_at
+  ) AS last_audit_at,
+  (
+    SELECT COUNT(*)::BIGINT
+    FROM core.integrations i
+    WHERE i.project_id = p.id
+  ) AS integration_count,
+  (
+    SELECT COUNT(*)::BIGINT
+    FROM core.webhooks w
+    WHERE w.project_id = p.id
+      AND w.enabled
+  ) AS webhook_count
 FROM core.projects p
 WHERE p.id = $1
 `
@@ -235,6 +246,8 @@ type GetProjectOverviewRow struct {
 	PendingInvitationCount int64              `json:"pending_invitation_count"`
 	AuditEvents24h         int64              `json:"audit_events_24h"`
 	LastAuditAt            pgtype.Timestamptz `json:"last_audit_at"`
+	IntegrationCount       int64              `json:"integration_count"`
+	WebhookCount           int64              `json:"webhook_count"`
 }
 
 func (q *Queries) GetProjectOverview(ctx context.Context, id uuid.UUID) (GetProjectOverviewRow, error) {
@@ -253,6 +266,8 @@ func (q *Queries) GetProjectOverview(ctx context.Context, id uuid.UUID) (GetProj
 		&i.PendingInvitationCount,
 		&i.AuditEvents24h,
 		&i.LastAuditAt,
+		&i.IntegrationCount,
+		&i.WebhookCount,
 	)
 	return i, err
 }