feat(mindspace): 公开页分享组件、workspace 路径与 Plaza 发布增强

- 新增 public share widget 与 workspace relative path 解析
- 增强 publications/chat-plaza 发布链路与缩略图 demo
- 补充 schema、cover 检查脚本与回归测试

Co-authored-by: Cursor <cursoragent@cursor.com>

mindspace-workspace-sync.mjs

@@ -7,6 +7,7 @@ import {
   resolveUserWorkspaceRoot,
   resolveZoneDir,
 } from './user-space.mjs';
+import { resolveAssetWorkspaceRelativePath } from './mindspace-workspace-path.mjs';
 import { assetInternals } from './mindspace-assets.mjs';
 import { runBasicFileScan } from './mindspace-scan.mjs';
 import { buildWorkspaceStorageKey } from './workspace-storage.mjs';
@@ -193,12 +194,16 @@ export function createWorkspaceAssetSync({
 
       const now = Date.now();
       const visibility = category.category_code === 'public' ? 'public_candidate' : 'private';
+      const indexedWorkspacePath = resolveAssetWorkspaceRelativePath({
+        categoryCode: category.category_code,
+        originalFilename: file.filename,
+      });
       await conn.query(
         `INSERT INTO h5_assets
          (id, user_id, space_id, category_id, asset_type, mime_type, original_filename,
-          display_name, current_version_id, size_bytes, checksum, risk_level, visibility,
+          display_name, workspace_relative_path, current_version_id, size_bytes, checksum, risk_level, visibility,
           status, source_type, created_at, updated_at)
-         VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 'workspace', ?, ?)`,
+         VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 'workspace', ?, ?)`,
         [
           assetId,
           userId,
@@ -208,6 +213,7 @@ export function createWorkspaceAssetSync({
           detectedMimeType,
           file.filename,
           path.basename(file.filename, path.extname(file.filename)) || file.filename,
+          indexedWorkspacePath,
           versionId,
           buffer.length,
           checksum,
@@ -308,10 +314,14 @@ export function createWorkspaceAssetSync({
       );
 
       const now = Date.now();
+      const indexedWorkspacePath = resolveAssetWorkspaceRelativePath({
+        categoryCode: category.category_code,
+        originalFilename: file.filename,
+      });
       await conn.query(
         `UPDATE h5_assets
          SET current_version_id = ?, size_bytes = ?, checksum = ?, mime_type = ?,
-             asset_type = ?, risk_level = ?, status = ?, updated_at = ?
+             asset_type = ?, risk_level = ?, status = ?, workspace_relative_path = ?, updated_at = ?
          WHERE id = ? AND user_id = ?`,
         [
           versionId,
@@ -321,6 +331,7 @@ export function createWorkspaceAssetSync({
           assetInternals.assetTypeForMime(detectedMimeType),
           scan.riskLevel,
           assetStatus,
+          indexedWorkspacePath,
           now,
           existing.id,
           userId,