feat: 收口文档桥接与 OnlyOffice/Sidebar 回归

- 为 documents.save/meta/content、blocks.patch 与 sidebar.dataset.list 补齐 Rust 协议映射、共享契约与桥接执行器

- 对齐 BlockNote、Mindmap、OnlyOffice 的保存/路由元信息，并补真实浏览器回归脚本与 OnlyOffice 部署基线

- 忽略 Rust 本地构建产物与 Harness 调试状态文件，避免临时产物进入仓库历史

wolai-frontend/src/lib/onlyoffice/internal-url.ts

@@ -0,0 +1,93 @@
+const DEFAULT_ONLYOFFICE_INTERNAL_URL = "http://127.0.0.1:8081";
+const ONLYOFFICE_PROBE_PATH = "/web-apps/apps/api/documents/api.js";
+const RESOLVE_CACHE_TTL_MS = 30_000;
+
+const DEFAULT_ONLYOFFICE_INTERNAL_URL_CANDIDATES = [
+  DEFAULT_ONLYOFFICE_INTERNAL_URL,
+  "http://127.0.0.1:8082",
+  "http://localhost:8081",
+  "http://localhost:8082",
+];
+
+let cachedOnlyOfficeInternalUrl = "";
+let cachedOnlyOfficeInternalUrlAt = 0;
+let pendingOnlyOfficeInternalUrl: Promise<string> | null = null;
+
+const normalizeOnlyOfficeInternalUrl = (raw?: string | null) => {
+  const value = String(raw || "").trim().replace(/\/+$/, "");
+  if (!value) return "";
+  try {
+    const url = new URL(value);
+    if (url.protocol !== "http:" && url.protocol !== "https:") return "";
+    return url.toString().replace(/\/+$/, "");
+  } catch {
+    return "";
+  }
+};
+
+const getOnlyOfficeInternalUrlCandidates = () => {
+  const candidates: string[] = [];
+  const push = (value?: string | null) => {
+    const normalized = normalizeOnlyOfficeInternalUrl(value);
+    if (!normalized) return;
+    if (!candidates.includes(normalized)) candidates.push(normalized);
+  };
+
+  push(process.env.ONLYOFFICE_INTERNAL_URL);
+
+  for (const raw of String(process.env.ONLYOFFICE_INTERNAL_URL_CANDIDATES || "").split(",")) {
+    push(raw);
+  }
+
+  for (const value of DEFAULT_ONLYOFFICE_INTERNAL_URL_CANDIDATES) {
+    push(value);
+  }
+
+  return candidates.length > 0 ? candidates : [DEFAULT_ONLYOFFICE_INTERNAL_URL];
+};
+
+const probeOnlyOfficeInternalUrl = async (candidate: string) => {
+  try {
+    const probeUrl = new URL(ONLYOFFICE_PROBE_PATH, `${candidate}/`);
+    const response = await fetch(probeUrl, {
+      method: "HEAD",
+      redirect: "follow",
+      cache: "no-store",
+      signal: AbortSignal.timeout(2_500),
+    });
+    return response.ok;
+  } catch {
+    return false;
+  }
+};
+
+export const resolveOnlyOfficeInternalUrl = async () => {
+  const now = Date.now();
+  if (cachedOnlyOfficeInternalUrl && now - cachedOnlyOfficeInternalUrlAt < RESOLVE_CACHE_TTL_MS) {
+    return cachedOnlyOfficeInternalUrl;
+  }
+
+  if (pendingOnlyOfficeInternalUrl) {
+    return pendingOnlyOfficeInternalUrl;
+  }
+
+  pendingOnlyOfficeInternalUrl = (async () => {
+    const candidates = getOnlyOfficeInternalUrlCandidates();
+    for (const candidate of candidates) {
+      if (await probeOnlyOfficeInternalUrl(candidate)) {
+        return candidate;
+      }
+    }
+    return candidates[0] || DEFAULT_ONLYOFFICE_INTERNAL_URL;
+  })();
+
+  try {
+    const resolved = await pendingOnlyOfficeInternalUrl;
+    cachedOnlyOfficeInternalUrl = resolved;
+    cachedOnlyOfficeInternalUrlAt = Date.now();
+    return resolved;
+  } finally {
+    pendingOnlyOfficeInternalUrl = null;
+  }
+};
+