chore: bootstrap lean sysadmin-chronicles repo

Import the runnable game code, content, docs, scripts, and repo guidance while leaving local agent state, dependency installs, build output, and backup copies out of the published tree.

frontend/src/app.css

@@ -0,0 +1,35 @@
+:root {
+  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
+  color: #f2efe9;
+  background:
+    radial-gradient(circle at top left, rgba(214, 104, 56, 0.18), transparent 28%),
+    linear-gradient(180deg, #121315 0%, #171a1d 100%);
+  color-scheme: dark;
+  --panel: rgba(18, 20, 24, 0.82);
+  --panel-strong: rgba(24, 27, 31, 0.94);
+  --border: rgba(255, 255, 255, 0.1);
+  --text-muted: #bdb6ab;
+  --accent: #d66838;
+  --accent-soft: rgba(214, 104, 56, 0.18);
+  --good: #63b67a;
+  --warn: #d5a64b;
+  --bad: #c86565;
+  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
+}
+
+html, body, #app {
+  margin: 0;
+  min-height: 100%;
+}
+
+body {
+  min-height: 100vh;
+}
+
+button, input, textarea {
+  font: inherit;
+}
+
+button {
+  cursor: pointer;
+}