Switch feedback reverse proxy from IIS to NGINX

- Add nginx-wp-suite.conf: static site + /api/feedback proxy to the Power
  Automate trigger (SNI on, Host header, POST-only, body cap)
- Remove IIS web.config
- Update feedback-config.js comment and DEPLOYMENT.md to the NGINX setup

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

nginx-wp-suite.conf

@@ -0,0 +1,56 @@
+# ─────────────────────────────────────────────────────────────────────────────
+# Work Package Suite — NGINX site config
+#
+# Serves the static site and reverse-proxies feedback to a Power Automate
+# "When an HTTP request is received" trigger. The browser only ever sees the
+# same-origin path /api/feedback, so there is NO CORS and the secret trigger URL
+# (with its sig= token) never reaches client code.
+#
+# Install:
+#   1. Copy the project files to the web root (e.g. /var/www/wp-suite).
+#   2. Put this file at /etc/nginx/conf.d/wp-suite.conf
+#      (or /etc/nginx/sites-available/ + symlink into sites-enabled/).
+#   3. Replace server_name, the ssl_certificate paths, and the proxy_pass URL.
+#   4. sudo nginx -t && sudo systemctl reload nginx
+# ─────────────────────────────────────────────────────────────────────────────
+
+# Redirect plain HTTP to HTTPS
+server {
+    listen 80;
+    server_name wp-suite.company.local;          # <-- your internal hostname
+    return 301 https://$host$request_uri;
+}
+
+server {
+    listen 443 ssl;
+    server_name wp-suite.company.local;           # <-- your internal hostname
+
+    # Internal certificate from your company CA
+    ssl_certificate     /etc/nginx/ssl/wp-suite.crt;   # <-- cert path
+    ssl_certificate_key /etc/nginx/ssl/wp-suite.key;   # <-- key path
+    ssl_protocols TLSv1.2 TLSv1.3;
+
+    # Static site
+    root /var/www/wp-suite;                        # <-- web root
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ =404;
+    }
+
+    # ── Feedback proxy → Power Automate ──────────────────────────────────────
+    # Paste your real trigger URL into proxy_pass below, keeping the FULL query
+    # string (api-version, sp, sv, sig). A small body cap keeps this endpoint safe.
+    location = /api/feedback {
+        limit_except POST { deny all; }            # only accept POST
+        client_max_body_size 256k;
+
+        proxy_pass https://prod-XX.westus.logic.azure.com/workflows/REPLACE_WORKFLOW_ID/triggers/manual/paths/invoke?api-version=2016-06-01&sp=%2Ftriggers%2Fmanual%2Frun&sv=1.0&sig=REPLACE_SIGNATURE;
+
+        proxy_http_version 1.1;
+        proxy_ssl_server_name on;                  # SNI — required for *.logic.azure.com
+        proxy_set_header Host prod-XX.westus.logic.azure.com;   # <-- match your region host
+        proxy_set_header Content-Type application/json;
+        proxy_set_header Cookie "";                # don't leak site cookies upstream
+    }
+}