feat: add Novi AMS → Mailman 3 cron-based mirror sync bridge (IDAA)

Implements a full proof-of-concept for syncing IDAA's Novi AMS membership
groups to Mailman 3 mailing lists via a cron-triggered reconciliation approach.

Key changes:
- methods: rewrote sync engine around confirmed Novi API shape — group-based
  member fetch (/groups/{guid}/members + /customers/{uuid}), respects
  Active=false and UnsubscribeFromEmails=true flags
- methods: mirror_novi_group_to_mailman_list() diffs Novi group against
  Mailman roster and subscribes/unsubscribes accordingly (full mirror)
- methods: mirror_all_configured_mappings() iterates novi_mailman_sync
  config array in IDAA site cfg_json — this is the cron target
- router: replaced old /sync endpoint with POST /sync (all mappings) and
  POST /sync/group/{guid} (single mapping); removed webhook endpoint
  (sync is cron-based, not event-driven)
- router: added GET/POST/DELETE endpoints for list member inspection
  and manual subscribe/unsubscribe
- tests: two new e2e scripts covering connection checks and full member
  lifecycle; old webhook integration test archived

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/e2e/test_e2e_v3_action_novi_mailman.py

@@ -0,0 +1,99 @@
+"""
+E2E tests for the Novi-Mailman Bridge — API connection checks.
+
+Verifies that both the Novi AMS API and Mailman 3 REST API are reachable
+and that the credentials stored in IDAA site cfg_json are valid.
+
+Run from project root:
+    ./environment/bin/python3 tests/e2e/test_e2e_v3_action_novi_mailman.py
+
+Environment:
+    AE_API_BASE  — override the target API base URL (default: https://dev-api.oneskyit.com)
+
+Related tests:
+    test_e2e_v3_action_novi_mailman_lists.py  — member read/subscribe/unsubscribe lifecycle
+    test_e2e_v3_action_novi_mailman_sync.py   — full Novi → Mailman mirror sync (TODO)
+
+Credential storage:
+    All Novi and Mailman credentials live in IDAA site cfg_json (id_random='58_gJESdlUh').
+    See project memory for key names.
+"""
+
+import os
+import sys
+import time
+import requests
+
+BASE_URL    = os.environ.get('AE_API_BASE', 'https://dev-api.oneskyit.com')
+ACTION_BASE = f"{BASE_URL}/v3/action/e_novi_mailman"
+API_KEY     = "PMM4n50teUCaOMMTN8qOJA"
+
+AUTH_HEADERS = {
+    "X-Aether-API-Key": API_KEY,
+    "x-no-account-id":  "bypass",
+}
+
+pass_count = 0
+fail_count = 0
+
+
+def print_result(label: str, success: bool, message: str = ""):
+    global pass_count, fail_count
+    status = "✅ PASS" if success else "❌ FAIL"
+    msg = f"   {message}" if message else ""
+    print(f"  [{status}] {label}{msg}")
+    if success:
+        pass_count += 1
+    else:
+        fail_count += 1
+
+
+def test_novi_connection():
+    print("\n[1] Novi API Connection")
+    try:
+        resp = requests.get(f"{ACTION_BASE}/test_connection/novi", headers=AUTH_HEADERS, timeout=15)
+        data = resp.json().get('data', {})
+        if resp.status_code == 200 and data.get('ok'):
+            print_result("Novi credentials valid", True)
+        elif resp.status_code == 401:
+            print_result("Novi credentials valid", False, f"401 — {data.get('error', resp.text[:120])}")
+        else:
+            print_result("Novi credentials valid", False, f"HTTP {resp.status_code}: {resp.text[:120]}")
+    except Exception as e:
+        print_result("Novi credentials valid", False, f"Exception: {e}")
+
+
+def test_mailman_connection():
+    print("\n[2] Mailman 3 API Connection")
+    try:
+        resp = requests.get(f"{ACTION_BASE}/test_connection/mailman", headers=AUTH_HEADERS, timeout=15)
+        data = resp.json().get('data', {})
+        if resp.status_code == 200 and data.get('ok'):
+            print_result("Mailman credentials valid", True, f"version={data.get('version', 'unknown')}")
+        elif resp.status_code == 401:
+            print_result("Mailman credentials valid", False,
+                         f"401 — {data.get('error', resp.text[:120])}  "
+                         f"(add mailman_* keys to IDAA cfg_json)")
+        else:
+            print_result("Mailman credentials valid", False, f"HTTP {resp.status_code}: {resp.text[:120]}")
+    except Exception as e:
+        print_result("Mailman credentials valid", False, f"Exception: {e}")
+
+
+if __name__ == "__main__":
+    print("=" * 60)
+    print(" Novi-Mailman Bridge — Connection Tests")
+    print(f" Target: {ACTION_BASE}")
+    print("=" * 60)
+
+    t_start = time.time()
+
+    test_novi_connection()
+    test_mailman_connection()
+
+    elapsed = time.time() - t_start
+    print(f"\n{'=' * 60}")
+    print(f" Results: {pass_count} passed, {fail_count} failed  ({elapsed:.2f}s)")
+    print("=" * 60)
+
+    sys.exit(0 if fail_count == 0 else 1)