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/comments/[id].delete.ts

@@ -1,18 +1,19 @@
 import { unlink } from 'node:fs/promises'
 import { join } from 'node:path'
 import { eq, sql } 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, 'comment.delete')
+  const actor = await requirePermission(event, 'comment.delete')
   const id = Number(getRouterParam(event, 'id'))
   if (!Number.isInteger(id) || id <= 0) {
     throw createError({ statusCode: 400, statusMessage: 'Ungültige ID' })
   }
   const db = useDb()
   const comment = await db
-    .select({ uploadId: comments.uploadId })
+    .select({ uploadId: comments.uploadId, content: comments.content, userId: comments.userId, userName: users.name })
     .from(comments)
+    .innerJoin(users, eq(comments.userId, users.id))
     .where(eq(comments.id, id))
     .limit(1)
     .then(r => r[0])
@@ -30,5 +31,14 @@ export default defineEventHandler(async (event) => {
       await unlink(join(process.cwd(), 'public', f.cover)).catch(() => {})
     }
   }
+  if (comment) {
+    await logAudit(actor.id, 'delete_comment', { type: 'comment', id }, {
+      uploadId: comment.uploadId,
+      authorId: comment.userId,
+      authorName: comment.userName,
+      content: comment.content.slice(0, 500),
+      attachments: files.length,
+    })
+  }
   return { ok: true }
 })