feat(integration): initial Zoom Events backend integration

- Implemented Server-to-Server OAuth2 logic in e_zoom_methods.py.
- Created V3 Action router for Zoom (test_connection, fetch tickets, atomic sync).
- Added sync_zoom_attendees_to_event with mapping to Aether person/badge models.
- Registered /v3/action/e_zoom router.
- Added E2E connection test script.

tests/e2e/test_e2e_v3_action_zoom.py

@@ -0,0 +1,33 @@
+import requests
+import json
+
+# Configuration
+BASE_URL = "https://dev-api.oneskyit.com/v3/action/e_zoom"
+API_KEY = "PMM4n50teUCaOMMTN8qOJA"
+
+def test_zoom_connection():
+    print("--- Testing Zoom API Connection (V3 Action) ---")
+    url = f"{BASE_URL}/test_connection"
+    headers = {
+        "X-Aether-API-Key": API_KEY,
+        "x-no-account-id": "bypass"
+    }
+    
+    try:
+        response = requests.get(url, headers=headers)
+        print(f"Status: {response.status_code}")
+        
+        if response.status_code == 200:
+            print("✅ Success: API is reachable.")
+            print(f"   Response: {json.dumps(response.json()['data'], indent=2)}")
+        elif response.status_code == 401:
+            print("⚠️ Note: API reachable, but credentials missing in data_store.")
+            print(f"   Details: {response.json().get('status_message')}")
+        else:
+            print(f"❌ Failed: {response.text}")
+            
+    except Exception as e:
+        print(f"💥 Exception: {e}")
+
+if __name__ == "__main__":
+    test_zoom_connection()