feat: remove AI extensions, restructure settings, and add atomic voucher commits (#157)

Remove AI-dependent extensions (ai-chat, ai-categorization, receipt-ocr,
invoice-inbox) and their infrastructure (lib/ai/*, ai-consent, LangChain/
Anthropic/OpenAI deps) to simplify core and reduce bundle size.

Restructure monolithic settings page into dedicated sub-pages (company,
bookkeeping, invoicing, tax, banking, api, account, team, templates) with
shared layout and sidebar navigation.

Add atomic commit_journal_entry RPC so voucher number increment and status
update happen in a single transaction — prevents burned numbers on constraint
failures. Add continuity check report and voucher gap explanation tracking.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/api/settings/logo/route.ts

@@ -0,0 +1,96 @@
+import { createClient } from '@/lib/supabase/server'
+import { NextResponse } from 'next/server'
+import { requireCompanyId } from '@/lib/company/context'
+
+const MAX_SIZE = 2 * 1024 * 1024 // 2MB
+const ALLOWED_TYPES = ['image/png', 'image/jpeg', 'image/svg+xml', 'image/webp']
+
+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 })
+
+  const companyId = await requireCompanyId(supabase, user.id)
+  if (!companyId) return NextResponse.json({ error: 'No company' }, { status: 403 })
+
+  const formData = await request.formData()
+  const file = formData.get('file') as File | null
+
+  if (!file) {
+    return NextResponse.json({ error: 'Ingen fil angiven' }, { status: 400 })
+  }
+
+  if (!ALLOWED_TYPES.includes(file.type)) {
+    return NextResponse.json({ error: 'Otillåten filtyp. Tillåtna: PNG, JPG, SVG, WebP.' }, { status: 400 })
+  }
+
+  if (file.size > MAX_SIZE) {
+    return NextResponse.json({ error: 'Filen är för stor (max 2 MB).' }, { status: 400 })
+  }
+
+  const buffer = Buffer.from(await file.arrayBuffer())
+  const ext = file.name.split('.').pop() || 'png'
+  const storagePath = `logos/${companyId}/logo.${ext}`
+
+  // Upload (upsert to replace existing)
+  const { error: uploadError } = await supabase.storage
+    .from('documents')
+    .upload(storagePath, buffer, {
+      contentType: file.type,
+      upsert: true,
+    })
+
+  if (uploadError) {
+    return NextResponse.json({ error: `Uppladdning misslyckades: ${uploadError.message}` }, { status: 500 })
+  }
+
+  // Get public URL
+  const { data: urlData } = supabase.storage
+    .from('documents')
+    .getPublicUrl(storagePath)
+
+  // Update company settings
+  const { error: updateError } = await supabase
+    .from('company_settings')
+    .update({ logo_url: urlData.publicUrl })
+    .eq('company_id', companyId)
+
+  if (updateError) {
+    return NextResponse.json({ error: 'Kunde inte uppdatera inställningar' }, { status: 500 })
+  }
+
+  return NextResponse.json({ data: { logo_url: urlData.publicUrl } })
+}
+
+export async function DELETE() {
+  const supabase = await createClient()
+  const { data: { user } } = await supabase.auth.getUser()
+  if (!user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+
+  const companyId = await requireCompanyId(supabase, user.id)
+  if (!companyId) return NextResponse.json({ error: 'No company' }, { status: 403 })
+
+  // Get current logo path
+  const { data: settings } = await supabase
+    .from('company_settings')
+    .select('logo_url')
+    .eq('company_id', companyId)
+    .single()
+
+  if (settings?.logo_url) {
+    // Extract storage path from URL
+    const url = new URL(settings.logo_url)
+    const pathMatch = url.pathname.match(/\/object\/public\/documents\/(.+)/)
+    if (pathMatch) {
+      await supabase.storage.from('documents').remove([pathMatch[1]])
+    }
+  }
+
+  // Clear logo_url
+  await supabase
+    .from('company_settings')
+    .update({ logo_url: null })
+    .eq('company_id', companyId)
+
+  return NextResponse.json({ data: { logo_url: null } })
+}