Upgrade Asset Manager and Inbox; load Resend templates in Broadcast; v2.5.0

- Asset Manager: search/filter/sort, list+grid views, rename, move between R2 folders, tag chips, bulk actions, used-in counts; fix R2 delete lookup
- Inbox: readable wrapped rows with subject/preview, real read state, type filters, bulk actions, mojibake repair
- Broadcast: pick a Resend template to fill subject and body

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/data.js

@@ -1009,6 +1009,8 @@ export async function listUploadedAssets() {
             : Array.isArray(entry?.tags) ? entry.tags.filter(t => typeof t === 'string') : []
           return {
             filename,
+            key: obj.Key,
+            storage: 'r2',
             url: `${R2_PUBLIC_URL}/${obj.Key}`,
             folder,
             sizeBytes: obj.Size ?? 0,
@@ -1036,8 +1038,10 @@ export async function listUploadedAssets() {
         : Array.isArray(entry?.tags) ? entry.tags.filter(t => typeof t === 'string') : []
       return {
         filename,
+        key: filename,
+        storage: 'local',
         url: `/uploads/${filename}`,
-        folder: 'uploads',
+        folder: 'local',
         sizeBytes: info.size,
         updatedAt: info.mtime.toISOString(),
         tags,