卫戍协议：盟约 web remake — initial import

Online co-op browser remake of Arknights' Stronghold Protocol: Alliance
(client-simulated combat, official waves/bonds/items/strategies, 3D board,
facing wheel, operator loadout, official emotes, deployment scripts).

server/sim/content/bands.js

@@ -0,0 +1,27 @@
+// server/sim/content/bands.js — the 40 strategies (bands, 策略/分队), battle side + prep side (DESIGN §7, research 01 §11).
+//
+// Entry point imported by content/index.js:
+//   install(battle)          IN_BATTLE band buffs of every player of the battle — bands/battle.js
+//   registerMeta(registry)   prep-side band effects (band:<bandId>) + the 鸭爵 global — bands/meta.js
+// Starting LP (totalHp), the draft and 坎诺特's kept leftover funds are the match's own rules (Match / PlayerState).
+// Parts are loaded with guarded dynamic imports and run in isolation: one failing part never disables the other
+// (the first error is re-thrown afterwards so content/index.js records it in battle.errors / the server log).
+
+async function load(path) {
+  try {
+    return await import(path);
+  } catch (e) {
+    console.error(`[content] failed to load ${path}: ${e && e.stack ? e.stack.split('\n').slice(0, 3).join(' | ') : e}`);
+    return {};
+  }
+}
+
+const [battlePart, metaPart] = await Promise.all([load('./bands/battle.js'), load('./bands/meta.js')]);
+
+export function install(battle) {
+  if (typeof battlePart.install === 'function') battlePart.install(battle);
+}
+
+export function registerMeta(registry) {
+  if (typeof metaPart.registerMeta === 'function') metaPart.registerMeta(registry);
+}