Dev: add web-bff launch config for the production BFF on :8090

Runs the Web App Go BFF (go run . in Web App/server) that serves the
embedded dist and proxies /api -> :8080, so the compiled bundle can be
verified locally alongside the Vite dev server.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.claude/launch.json

@@ -17,6 +17,14 @@
       "port": 5173,
       "autoPort": false
     },
+    {
+      "name": "web-bff",
+      "runtimeExecutable": "go",
+      "runtimeArgs": ["run", "."],
+      "cwd": "Web App/server",
+      "port": 8090,
+      "autoPort": false
+    },
     {
       "name": "panel",
       "runtimeExecutable": "npm",