chore(config): remove Providers array from appsettings — now in DB

Provider config is no longer read from appsettings or env vars.
All three providers (ejobs.ro, bestjobs.eu, linkedin.com) are seeded
into cvSearch.JobProviders by the AddJobProviders migration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Apis/cv-matcher-api/appsettings.json

@@ -112,32 +112,6 @@
     "JobSearchLinkBaseUrl": "https://myai.ro",
     "TokenExpiryDays": 7,
     "MinMatchScore": 15,
-    "MaxJobsToMatch": 15,
-    "Providers": [
-      {
-        "Name": "ejobs.ro",
-        "Enabled": false,
-        "SearchUrlTemplate": "https://www.ejobs.ro/locuri-de-munca/{keywords}/",
-        "JobLinkContains": "/user/locuri-de-munca/job/",
-        "InitialKeywords": [],
-        "MaxResults": 20
-      },
-      {
-        "Name": "bestjobs.eu",
-        "Enabled": false,
-        "SearchUrlTemplate": "https://www.bestjobs.eu/ro/locuri-de-munca?q={keywords}",
-        "JobLinkContains": "/ro/locuri-de-munca/",
-        "InitialKeywords": [],
-        "MaxResults": 20
-      },
-      {
-        "Name": "linkedin.com",
-        "Enabled": false,
-        "SearchUrlTemplate": "https://www.linkedin.com/jobs/search/?keywords={keywords}&location=Romania",
-        "JobLinkContains": "/jobs/view/",
-        "InitialKeywords": [],
-        "MaxResults": 20
-      }
-    ]
+    "MaxJobsToMatch": 15
   }
 }