chore: initial commit of foundryvtt-admin

Spun out of the hbm-books working folder into its own repo. A small
backend+frontend+COBOL admin tool for managing Foundry VTT worlds
(socket inspection, join/shutdown debugging).

cobol/hbm-admin.cbl

@@ -0,0 +1,26 @@
+       IDENTIFICATION DIVISION.
+       PROGRAM-ID. HBM-ADMIN.
+      *
+       DATA DIVISION.
+       WORKING-STORAGE SECTION.
+       01  URL-STRING          PIC X(100) 
+           VALUE "http://backend:3000/api/actors/update".
+       01  JSON-PAYLOAD        PIC X(200).
+       01  RESULT-CODE         PIC S9(9) BINARY.
+      *
+       PROCEDURE DIVISION.
+       MAIN-LOGIC.
+           MOVE "Gimli" TO JSON-PAYLOAD.
+           DISPLAY "Calling API for: " JSON-PAYLOAD.
+           
+           CALL "send_actor_update" USING BY REFERENCE URL-STRING
+                                          BY REFERENCE JSON-PAYLOAD
+                                    RETURNING RESULT-CODE.
+                                    
+           IF RESULT-CODE = 1
+               DISPLAY "Update successful!"
+           ELSE
+               DISPLAY "Update failed."
+           END-IF.
+           
+           STOP RUN.