feat: improve mindspace asset handling and local runtime paths

mindspace-assets.mjs

@@ -822,6 +822,25 @@ export function createAssetService(pool, options = {}) {
     };
   };
 
+  const readPublicAsset = async (assetId) => {
+    const [rows] = await pool.query(
+      `SELECT a.*, c.category_code, v.storage_key, v.scan_status
+       FROM h5_assets a
+       JOIN h5_space_categories c ON c.id = a.category_id AND c.user_id = a.user_id
+       JOIN h5_asset_versions v ON v.id = a.current_version_id
+       WHERE a.id = ? AND a.status <> 'deleted'
+       LIMIT 1`,
+      [assetId],
+    );
+    const asset = rows[0];
+    if (!asset) throw Object.assign(new Error('资产不存在'), { code: 'asset_not_found' });
+    assertAssetDownloadable(asset);
+    return {
+      asset: assetResponse(asset),
+      path: await resolveReadableStoragePath(asset.storage_key),
+    };
+  };
+
   const createChatAsset = async (
     userId,
     { categoryCode, buffer, filename, displayName, sourceType = 'chat' },
@@ -1101,6 +1120,7 @@ export function createAssetService(pool, options = {}) {
     listAssets,
     deleteAsset,
     readAsset,
+    readPublicAsset,
     renderAssetPreview,
     extractAssetText,
     renderAssetThumbnail,