feat(trading-twins): Finalize Booking Engine & Infrastructure [31988f42]

- Implemented 'Direct Calendar Booking' logic replacing MS Bookings API.
- Integrated Dual-App architecture for Graph API (Sender vs. Reader permissions).
- Added FastAPI feedback server for Teams and Email interactions.
- Configured Nginx proxy for public feedback URL access.
- Updated Docker configuration (ports, env vars, dependencies).
- Finalized documentation in lead-engine/README.md.

nginx-proxy.conf

@@ -166,6 +166,14 @@ http {
             proxy_read_timeout 86400; # Long timeout for stream
         }
 
+        location /feedback/ {
+            # Public endpoint for Teams Feedback actions
+            auth_basic off; # Must be public for external links
+            proxy_pass http://lead-engine:8004/;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+        }
+
         location /connector/ {
             # SuperOffice Connector Webhook & Dashboard
             auth_basic off;