feat: unified document inbox, full BAS 2026, and document-transaction matching

- Expand BAS reference from ~180 to ~1,276 accounts (full BAS Kontoplan 2026)
  with K2 exclusion flags, per-class data files, and computed SRU codes
- Evolve invoice inbox into unified document inbox handling invoices, receipts,
  and government letters with AI-powered classification (Claude Haiku Vision)
- Add multi-pass document-to-transaction matching engine with greedy assignment
  for both supplier invoices (reference/amount/date/name) and receipts
  (weighted amount/merchant/date scoring)
- Add supplier invoice matching in transaction ingest pipeline
- Inject booking template suggestions into AI extraction prompts
- Surface matched documents in swipe categorization UI with one-tap booking
- Auto-activate missing BAS accounts during SIE import against full reference
- Add K2 filter toggle in Chart of Accounts manager
- Add receipt confirmation route with BFNAR representation fields
- Add database migrations for K2 support and document matching columns
- Remove obsolete extension migration scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/api/documents/match-sweep/route.ts

@@ -0,0 +1,31 @@
+import { createClient } from '@/lib/supabase/server'
+import { NextResponse } from 'next/server'
+import { runDocumentMatchingSweep } from '@/lib/documents/batch-match'
+
+export async function POST(request: Request) {
+  const supabase = await createClient()
+  const { data: { user } } = await supabase.auth.getUser()
+
+  if (!user) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  }
+
+  // Optional: pass specific inbox item IDs to match
+  let inboxItemIds: string[] | undefined
+  try {
+    const body = await request.json()
+    if (Array.isArray(body?.inboxItemIds)) {
+      inboxItemIds = body.inboxItemIds
+    }
+  } catch {
+    // No body or invalid JSON — sweep all unmatched items
+  }
+
+  try {
+    const result = await runDocumentMatchingSweep(supabase, user.id, inboxItemIds)
+    return NextResponse.json({ data: result })
+  } catch (error) {
+    console.error('[match-sweep] Failed:', error)
+    return NextResponse.json({ error: 'Match sweep failed' }, { status: 500 })
+  }
+}