fix(campaigns): defer Jira ticket creation to start_date, gate recurring campaigns behind manager approval

- Approve endpoint now only creates Jira tickets immediately when
  start_date is now/past; a new periodic job (every 15 min) catches
  campaigns whose scheduled start_date has since arrived.
- Recurring campaign clones now go to pending_approval instead of
  active, routing through the same manager-approval gate as any other
  campaign; managers are notified instead of red_tech.
- Fix UTC conversion for the campaign approval start_date input and
  extract shared isoToDatetimeLocal/datetimeLocalToIso helpers.

backend/tests/test_campaign_approval_router.py

@@ -45,7 +45,7 @@ def test_manager_can_approve_and_sets_start_date(api, db, red_lead_user, red_lea
         "post",
         f"/api/v1/campaigns/{campaign.id}/approve",
         manager_headers,
-        json={"start_date": "2026-09-01T00:00:00"},
+        json={"start_date": "2020-01-01T00:00:00"},
     )
     assert resp.status_code == 200
     body = resp.json()
@@ -53,10 +53,13 @@ def test_manager_can_approve_and_sets_start_date(api, db, red_lead_user, red_lea
     assert body["start_date"] is not None
 
 
-def test_manager_approval_creates_jira_tickets(api, db, red_lead_user, red_lead_headers, manager_headers):
+def test_manager_approval_creates_jira_tickets_when_start_date_is_due(
+    api, db, red_lead_user, red_lead_headers, manager_headers
+):
     """The normal manager-approval path must create Jira tickets too, not just
     the admin-only emergency /activate override — this was the Block 1 gap:
-    campaigns approved through the standard flow never got a Jira ticket."""
+    campaigns approved through the standard flow never got a Jira ticket.
+    Uses a past start_date so ticket creation is due immediately."""
     campaign = _make_draft_campaign(db, red_lead_user.id)
     api("post", f"/api/v1/campaigns/{campaign.id}/submit", red_lead_headers)
 
@@ -68,7 +71,7 @@ def test_manager_approval_creates_jira_tickets(api, db, red_lead_user, red_lead_
             "post",
             f"/api/v1/campaigns/{campaign.id}/approve",
             manager_headers,
-            json={"start_date": "2026-09-01T00:00:00"},
+            json={"start_date": "2020-01-01T00:00:00"},
         )
 
     assert resp.status_code == 200
@@ -77,6 +80,29 @@ def test_manager_approval_creates_jira_tickets(api, db, red_lead_user, red_lead_
     mock_create_test.assert_called_once()
 
 
+def test_manager_approval_skips_jira_tickets_when_start_date_is_future(
+    api, db, red_lead_user, red_lead_headers, manager_headers
+):
+    """A campaign scheduled to start in the future must not get its Jira
+    tickets created at approval time — that must wait for the periodic
+    due-campaign sync job, once the scheduled start_date actually arrives."""
+    campaign = _make_draft_campaign(db, red_lead_user.id)
+    api("post", f"/api/v1/campaigns/{campaign.id}/submit", red_lead_headers)
+
+    with patch("app.services.jira_service.get_campaign_jira_key", return_value=None) as mock_get_key, \
+         patch("app.services.jira_service.auto_create_campaign_issue", return_value="PT-100") as mock_create_campaign:
+        resp = api(
+            "post",
+            f"/api/v1/campaigns/{campaign.id}/approve",
+            manager_headers,
+            json={"start_date": "2099-01-01T00:00:00"},
+        )
+
+    assert resp.status_code == 200
+    mock_get_key.assert_not_called()
+    mock_create_campaign.assert_not_called()
+
+
 def test_lead_cannot_approve(api, db, red_lead_user, red_lead_headers):
     campaign = _make_draft_campaign(db, red_lead_user.id)
     api("post", f"/api/v1/campaigns/{campaign.id}/submit", red_lead_headers)