feat: complete TASK-WP0-05 storage capacity

tests/e2e/fixtures/storage-capacity.ts

@@ -0,0 +1,17 @@
+import { classifyCapacity, decideStorageAction } from "../../../apps/api/src/storage-policy.js";
+
+const root = document.querySelector<HTMLElement>("#root");
+if (!root) throw new Error("Fixture root is missing.");
+const capacity = classifyCapacity(5_368_709_120, 0);
+const actions = ["project_json_write", "binary_write", "read", "download", "permanent_delete", "explicit_cleanup"] as const;
+root.innerHTML = `
+  <h1>本机存储容量</h1>
+  <p data-status>${capacity.storage_status}</p>
+  <div class="bar" role="progressbar" aria-valuemin="0" aria-valuemax="5368709120" aria-valuenow="5368709120"><span></span></div>
+  <table><thead><tr><th>操作</th><th>结果</th></tr></thead><tbody>
+    ${actions.map((action) => `<tr><td>${action}</td><td>${decideStorageAction("full", true, action)}</td></tr>`).join("")}
+  </tbody></table>
+  <h2>存储不可用</h2>
+  <table data-unavailable><thead><tr><th>操作</th><th>SQLite 可写</th><th>SQLite 不可写</th></tr></thead><tbody>
+    ${actions.map((action) => `<tr><td>${action}</td><td>${decideStorageAction("unavailable", true, action)}</td><td>${decideStorageAction("unavailable", false, action)}</td></tr>`).join("")}
+  </tbody></table>`;