refactor: clean up codebase, remove dead code and obsolete docs

Remove influencer-era documentation, unused components, boilerplate
assets, and ghost tiktok cron job. Add supplier invoice management,
document API routes, and PWA icons. Replace boilerplate README.

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

app/api/documents/route.ts

@@ -0,0 +1,108 @@
+import { createClient } from '@/lib/supabase/server'
+import { NextResponse } from 'next/server'
+import { ensureInitialized } from '@/lib/init'
+import { uploadDocument } from '@/lib/core/documents/document-service'
+
+ensureInitialized()
+
+/**
+ * POST /api/documents
+ * Upload a document to the WORM archive
+ *
+ * Accepts multipart/form-data with:
+ * - file: The document file
+ * - upload_source (optional): 'camera' | 'file_upload' | 'email' | ...
+ * - journal_entry_id (optional): Link to a journal entry
+ * - journal_entry_line_id (optional): Link to a journal entry line
+ */
+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 })
+  }
+
+  try {
+    const formData = await request.formData()
+    const file = formData.get('file') as File | null
+
+    if (!file) {
+      return NextResponse.json({ error: 'No file provided' }, { status: 400 })
+    }
+
+    const uploadSource = (formData.get('upload_source') as string) || 'file_upload'
+    const journalEntryId = formData.get('journal_entry_id') as string | null
+    const journalEntryLineId = formData.get('journal_entry_line_id') as string | null
+
+    const buffer = await file.arrayBuffer()
+
+    const document = await uploadDocument(user.id, {
+      name: file.name,
+      buffer,
+      type: file.type,
+    }, {
+      upload_source: uploadSource as import('@/types').DocumentUploadSource,
+      journal_entry_id: journalEntryId || undefined,
+      journal_entry_line_id: journalEntryLineId || undefined,
+    })
+
+    return NextResponse.json({ data: document })
+  } catch (error) {
+    console.error('[documents/POST] Upload failed:', error)
+    return NextResponse.json(
+      { error: error instanceof Error ? error.message : 'Upload failed' },
+      { status: 500 }
+    )
+  }
+}
+
+/**
+ * GET /api/documents
+ * List documents with optional filtering
+ *
+ * Query params:
+ * - journal_entry_id: Filter by journal entry
+ * - current_only: If 'true', only return current versions (default: true)
+ * - limit: Number of results (default: 50)
+ * - offset: Pagination offset (default: 0)
+ */
+export async function GET(request: Request) {
+  const supabase = await createClient()
+
+  const { data: { user } } = await supabase.auth.getUser()
+
+  if (!user) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  }
+
+  const { searchParams } = new URL(request.url)
+  const journalEntryId = searchParams.get('journal_entry_id')
+  const currentOnly = searchParams.get('current_only') !== 'false'
+  const limit = parseInt(searchParams.get('limit') || '50')
+  const offset = parseInt(searchParams.get('offset') || '0')
+
+  let query = supabase
+    .from('document_attachments')
+    .select('*', { count: 'exact' })
+    .eq('user_id', user.id)
+    .order('created_at', { ascending: false })
+    .range(offset, offset + limit - 1)
+
+  if (journalEntryId) {
+    query = query.eq('journal_entry_id', journalEntryId)
+  }
+
+  if (currentOnly) {
+    query = query.eq('is_current_version', true)
+  }
+
+  const { data, error, count } = await query
+
+  if (error) {
+    return NextResponse.json({ error: error.message }, { status: 500 })
+  }
+
+  return NextResponse.json({ data, count })
+}