feat(lead-engine): Implement Teams notification and email enhancements [31988f42]

- Enhanced Teams Adaptive Card with precise email send time and re-added emojis to action buttons ("✅ JETZT Aussenden", "❌ STOP Aussendung").
- Modified email sending logic to include HTML signature from `signature.html` and an inline banner image from `RoboPlanetBannerWebinarEinladung.png`.
- Documented future enhancements in `lead-engine/README.md`:
    - Race-condition protection for calendar bookings with a live calendar check.
    - Integration of booking confirmation pages into the WordPress website (iFrame first, then API integration).

lead-engine/trading_twins/teams_notification.py

@@ -6,13 +6,13 @@ from datetime import datetime
 # Default-Webhook (Platzhalter) - sollte in .env stehen
 DEFAULT_WEBHOOK_URL = os.getenv("TEAMS_WEBHOOK_URL", "")
 
-def send_approval_card(job_uuid, customer_name, time_string, webhook_url=DEFAULT_WEBHOOK_URL):
+def send_approval_card(job_uuid, customer_name, time_string, webhook_url=DEFAULT_WEBHOOK_URL, api_base_url="http://localhost:8004"):
     """
     Sendet eine Adaptive Card an Teams mit Approve/Deny Buttons.
     """
     
     # Die URL unserer API (muss von außen erreichbar sein, z.B. via ngrok oder Server-IP)
-    api_base_url = os.getenv("API_BASE_URL", "http://localhost:8004")
+
     
     card_payload = {
         "type": "message",
@@ -27,33 +27,27 @@ def send_approval_card(job_uuid, customer_name, time_string, webhook_url=DEFAULT
                     "body": [
                         {
                             "type": "TextBlock",
-                            "text": f"🤖 Automatisierte E-Mail an {customer_name}",
+                            "text": f"🤖 Automatisierte E-Mail an {customer_name} (via Trading Twins) wird um {time_string} Uhr ausgesendet.",
                             "weight": "Bolder",
                             "size": "Medium"
                         },
                         {
                             "type": "TextBlock",
-                            "text": f"(via Trading Twins) wird um {time_string} Uhr ausgesendet.",
+                            "text": "Wenn Du bis {time_string} Uhr NICHT reagierst, wird die generierte E-Mail automatisch ausgesendet.",
                             "isSubtle": True,
                             "wrap": True
-                        },
-                        {
-                            "type": "TextBlock",
-                            "text": "Wenn Du bis dahin NICHT reagierst, wird die E-Mail automatisch gesendet.",
-                            "color": "Attention",
-                            "wrap": True
                         }
                     ],
                     "actions": [
                         {
                             "type": "Action.OpenUrl",
                             "title": "✅ JETZT Aussenden",
-                            "url": f"{api_base_url}/action/approve/{job_uuid}"
+                            "url": f"{api_base_url}/send_now/{job_uuid}"
                         },
                         {
                             "type": "Action.OpenUrl",
                             "title": "❌ STOP Aussendung",
-                            "url": f"{api_base_url}/action/cancel/{job_uuid}"
+                            "url": f"{api_base_url}/stop/{job_uuid}"
                         }
                     ]
                 }