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/http_client.c

@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <curl/curl.h>
+
+int send_actor_update(const char* url, const char* json_data) {
+    CURL *curl;
+    CURLcode res;
+    int success = 1;
+
+    curl = curl_easy_init();
+    if(curl) {
+        struct curl_slist *headers = NULL;
+        headers = curl_slist_append(headers, "Content-Type: application/json");
+
+        curl_easy_setopt(curl, CURLOPT_URL, url);
+        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
+        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, json_data);
+
+        res = curl_easy_perform(curl);
+        if(res != CURLE_OK) {
+            fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
+            success = 0;
+        }
+
+        curl_slist_free_all(headers);
+        curl_easy_cleanup(curl);
+    }
+    return success;
+}