fix: pin API dev port to 5081 (match Vite proxy config)

Default launchSettings.json from `dotnet new web` picked random port 5039,
which doesn't match the Vite proxy target http://localhost:5081, so the
React app can't reach /connect/token during login.

- Fix http profile to 5081 (HTTPS to 5443)
- Remove IIS Express profile (Mac-only dev, not needed)
- Disable launchBrowser (we run Web separately)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/food-market.api/Properties/launchSettings.json

@@ -1,19 +1,11 @@
-{
+{
   "$schema": "http://json.schemastore.org/launchsettings.json",
-  "iisSettings": {
-    "windowsAuthentication": false,
-    "anonymousAuthentication": true,
-    "iisExpress": {
-      "applicationUrl": "http://localhost:30851",
-      "sslPort": 44329
-    }
-  },
   "profiles": {
     "http": {
       "commandName": "Project",
       "dotnetRunMessages": true,
-      "launchBrowser": true,
+      "launchBrowser": false,
-      "applicationUrl": "http://localhost:5039",
+      "applicationUrl": "http://localhost:5081",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
       }
@@ -21,15 +13,8 @@
     "https": {
       "commandName": "Project",
       "dotnetRunMessages": true,
-      "launchBrowser": true,
+      "launchBrowser": false,
-      "applicationUrl": "https://localhost:7275;http://localhost:5039",
+      "applicationUrl": "https://localhost:5443;http://localhost:5081",
-      "environmentVariables": {
-        "ASPNETCORE_ENVIRONMENT": "Development"
-      }
-    },
-    "IIS Express": {
-      "commandName": "IISExpress",
-      "launchBrowser": true,
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
       }