Add data-modeling and appsource knowledge articles (MICROSOFT layer) (#65)

Author 7 remedial BCQuality knowledge articles plus good/bad AL samples
(21 files) covering AL master-table and data-model design:

- data-modeling: master No. from number series in OnInsert; use codeunit
  "No. Series" not obsolete NoSeriesManagement; setup table is a singleton;
  set Last Date Modified in OnModify and OnRename; enforce Blocked in
  referencing code not in the master.
- style: ApplicationArea required on page controls (AS0062).
- appsource: object affixes prevent collisions (AS0011).

Clean-room authored from own BC knowledge; specifics verified against public
sources only (learn.microsoft.com, microsoft/BCApps). Introduces two new
domains (data-modeling, appsource).

Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

microsoft/knowledge/data-modeling/check-blocked-in-referencing-code-not-in-master.bad.al

@@ -0,0 +1,71 @@
+table 50372 "Loyalty Member"
+{
+    Caption = 'Loyalty Member';
+    DataClassification = CustomerContent;
+
+    fields
+    {
+        field(1; "No."; Code[20])
+        {
+            Caption = 'No.';
+        }
+        field(10; Name; Text[100])
+        {
+            Caption = 'Name';
+        }
+        field(20; Blocked; Boolean)
+        {
+            Caption = 'Blocked';
+        }
+    }
+
+    keys
+    {
+        key(PK; "No.")
+        {
+            Clustered = true;
+        }
+    }
+
+    // Anti-pattern: the block check sits in the master's own trigger. Editing a
+    // blocked member is rare; referencing it is constant, and references never
+    // fire OnModify. So this stops nothing that matters.
+    trigger OnModify()
+    begin
+        TestField(Blocked, false);
+    end;
+}
+
+table 50373 "Loyalty Point Entry"
+{
+    Caption = 'Loyalty Point Entry';
+    DataClassification = CustomerContent;
+
+    fields
+    {
+        field(1; "Entry No."; Integer)
+        {
+            Caption = 'Entry No.';
+            AutoIncrement = true;
+        }
+        field(10; "Member No."; Code[20])
+        {
+            Caption = 'Member No.';
+            TableRelation = "Loyalty Member"."No.";
+            // No block check on the referencing side: a line can freely
+            // reference a blocked member, and posting proceeds unchecked.
+        }
+        field(20; Points; Integer)
+        {
+            Caption = 'Points';
+        }
+    }
+
+    keys
+    {
+        key(PK; "Entry No.")
+        {
+            Clustered = true;
+        }
+    }
+}