Add audit log for moderation and admin actions

New audit_log table records actor, action, target and a JSON snapshot
of the details, so entries stay readable after the target is deleted;
the actor is set to NULL when the user is removed. logAudit() is called
from upload delete (single and bulk), comment delete, tag removal, role
create/delete, role permission changes, role assign/revoke and MOTD
updates. Logging failures only warn and never fail the action itself.

The admin page gets an audit card behind the new audit.view permission
with action filter, click-to-filter by user, readable summaries per
action and server-side pagination. Action catalog lives in
shared/utils/audit.ts, labels under admin.auditActions (de/en).

Generated with [Claude Code](https://claude.com/claude-code)

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

server/api/uploads/[id].delete.ts

@@ -1,10 +1,10 @@
 import { unlink } from 'node:fs/promises'
 import { join } from 'node:path'
 import { eq } from 'drizzle-orm'
-import { commentAttachments, comments, uploads } from '../../db/schema'
+import { commentAttachments, comments, uploads, users } from '../../db/schema'
 
 export default defineEventHandler(async (event) => {
-  await requirePermission(event, 'upload.delete')
+  const actor = await requirePermission(event, 'upload.delete')
   const id = getRouterParam(event, 'id') ?? ''
   if (!/^[A-Za-z0-9]{1,16}$/.test(id)) {
     throw createError({ statusCode: 400, statusMessage: 'Ungültige ID' })
@@ -12,8 +12,9 @@ export default defineEventHandler(async (event) => {
   const db = useDb()
 
   const [upload] = await db
-    .select({ fileName: uploads.fileName, previewImage: uploads.previewImage })
+    .select({ fileName: uploads.fileName, previewImage: uploads.previewImage, type: uploads.type, originalName: uploads.originalName, userId: uploads.userId, userName: users.name })
     .from(uploads)
+    .innerJoin(users, eq(uploads.userId, users.id))
     .where(eq(uploads.id, id))
     .limit(1)
   if (!upload) {
@@ -40,5 +41,11 @@ export default defineEventHandler(async (event) => {
     }
   }
   broadcastToAll({ type: 'upload-deleted', ids: [id] })
+  await logAudit(actor.id, 'delete_upload', { type: 'upload', id }, {
+    uploadType: upload.type,
+    originalName: upload.originalName,
+    uploaderId: upload.userId,
+    uploaderName: upload.userName,
+  })
   return { ok: true }
 })