feat(backend): add communication, tester, admin and middleman modules

Implement step 17 modules: threads/messages, notifications with automation (submission.created, idea.created, grant_call.opened), innovation test feedback, admin panel (submissions, verify, metrics, grant call status), Middleman adaptation and partnerships. Split multi-type files into one type per file and replace object-valued dictionaries with string-valued maps in data contracts (migrations 0006/0007).

backend/Application/Security/ConsentScopes.cs

@@ -0,0 +1,16 @@
+namespace TarninaHub.Application.Security;
+
+
+public static class ConsentScopes
+{
+    /// <summary>Access granted by the data subject's consent.</summary>
+    public const string ByConsent = "by-consent";
+
+    /// <summary>Time-limited access (uses consent.expires_at).</summary>
+    public const string Temporary = "temporary";
+
+    /// <summary>Fully anonymized data (no personal identifiers).</summary>
+    public const string Anonymized = "anonymized";
+
+    public static readonly IReadOnlyList<string> All = [ByConsent, Temporary, Anonymized];
+}