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/use-no-series-codeunit-not-noseriesmanagement.good.al

@@ -0,0 +1,55 @@
+table 50362 "Loyalty Member"
+{
+    Caption = 'Loyalty Member';
+    DataClassification = CustomerContent;
+
+    fields
+    {
+        field(1; "No."; Code[20])
+        {
+            Caption = 'No.';
+
+            trigger OnValidate()
+            var
+                NoSeries: Codeunit "No. Series";
+            begin
+                if "No." = xRec."No." then
+                    exit;
+                LoyaltySetup.Get();
+                if not NoSeries.IsManual(LoyaltySetup."Member Nos.") then
+                    Error(ManualNosNotAllowedErr);
+                "No. Series" := '';
+            end;
+        }
+        field(2; "No. Series"; Code[20])
+        {
+            Caption = 'No. Series';
+            Editable = false;
+            TableRelation = "No. Series";
+        }
+    }
+
+    keys
+    {
+        key(PK; "No.")
+        {
+            Clustered = true;
+        }
+    }
+
+    var
+        LoyaltySetup: Record "Loyalty Setup";
+        ManualNosNotAllowedErr: Label 'Numbers are assigned automatically. Allow manual numbers on the No. Series to enter one by hand.';
+
+    trigger OnInsert()
+    var
+        NoSeries: Codeunit "No. Series";
+    begin
+        if "No." = '' then begin
+            LoyaltySetup.Get();
+            LoyaltySetup.TestField("Member Nos.");
+            "No. Series" := LoyaltySetup."Member Nos.";
+            "No." := NoSeries.GetNextNo("No. Series");
+        end;
+    end;
+}