Refactor to use configurable FakeProfileId

Replaced hardcoded FakeProfileId with a dynamic value retrieved
from the configuration using a new GetFakeProfileId extension
method. Updated OutResController and RecActionController to
inject IConfiguration and use the new method. Added a new
HttpGet endpoint in OutResController for fake profile queries.

Modified appsettings.json to include a FakeProfileId setting
with a default value of 2. Introduced ConfigurationExtensions
to centralize configuration access logic, improving code
maintainability and flexibility.

src/ReC.API/appsettings.json

@@ -13,5 +13,6 @@
   "RecAction": {
     "MaxConcurrentInvocations": 5
   },
-  "AddedWho": "ReC.API"
+  "AddedWho": "ReC.API",
+  "FakeProfileId": 2
 }