Supp/invoice bfl errors (#390)

* feat(accounting): update accounting method validation and messaging for aktiebolag and enskild firma

* Remove AI subsystem and related code

- Deleted AI proposals and requests persistence logic from `lib/ai/proposals/persist.ts`.
- Removed re-validation logic for proposals in `lib/ai/proposals/re-validate.ts`.
- Cleaned up schemas related to AI flows in `lib/api/schemas.ts`.
- Removed AI-related fields from bookkeeping engine in `lib/bookkeeping/engine.ts`.
- Eliminated AI event types from `lib/events/types.ts`.
- Updated tests to reflect the removal of AI-related functionality in `lib/extensions/__tests__/sectors.test.ts`.
- Adjusted initialization logic in `lib/init.ts` to exclude AI proposal handler registration.
- Cleaned up transaction ingestion logic in `lib/transactions/ingest.ts` to remove AI flow checks.
- Updated helper functions in `tests/helpers.ts` to remove AI-related settings.
- Removed AI-related types and interfaces from `types/index.ts`.
- Added migration script to drop AI-related tables and settings from the database.

* fix(migrations): ensure foreign key constraint is dropped before removing AI tables

* feat(invoice-inbox): implement deterministic invoice field extraction and inbox provisioning

- Added `extract-invoice-fields.ts` for extracting fields from PDF invoices using regex and pdfjs-dist, replacing the previous AI classifier.
- Introduced `inbox-provisioning.ts` to manage company inbox addresses and rotation of inboxes using Supabase RPCs.
- Created `resend-inbound.ts` for handling inbound email events and attachments via the Resend API.
- Defined the extension manifest for the invoice inbox, specifying required environment variables and descriptions.
- Migrated database schema to remove AI-related columns and tighten the status enum in `invoice_inbox_items`.

* feat(invoice-inbox): remove AI-specific columns and tighten status enum

* fix(skattekonto): remove manual entry creation reference from transaction input

* fix(schemas): remove accounting method validation for aktiebolag in UpdateSettingsSchema

tests/helpers.ts

@@ -244,8 +244,6 @@ export function makeJournalEntry(overrides: Partial<JournalEntry> = {}): Journal
     notes: null,
     commit_method: null,
     rubric_version: null,
-    created_via: 'manual',
-    source_proposal_id: null,
     created_at: '2024-06-15T14:30:00Z',
     updated_at: '2024-06-15T14:30:00Z',
     ...overrides,
@@ -539,8 +537,6 @@ export function makeCompanySettings(
     onboarding_complete: true,
     sector_slug: null,
     is_sandbox: false,
-    ai_flow_enabled: false,
-    ai_backfill_cancel_requested: false,
     agent_auto_commit_enabled: false,
     agent_auto_commit_max_amount: null,
     created_at: '2024-01-01T00:00:00Z',
@@ -556,7 +552,7 @@ export function makeInvoiceInboxItem(
     id: nextId(),
     user_id: 'user-1',
     company_id: 'company-1',
-    status: 'pending',
+    status: 'received',
     source: 'upload',
     email_from: null,
     email_subject: null,
@@ -566,19 +562,10 @@ export function makeInvoiceInboxItem(
     resend_attachment_id: null,
     document_id: null,
     extracted_data: null,
-    confidence: null,
     matched_supplier_id: null,
     created_supplier_invoice_id: null,
     error_message: null,
-    document_type: 'supplier_invoice',
-    linked_receipt_id: null,
     raw_email_payload: null,
-    suggested_template_id: null,
-    suggested_template_confidence: null,
-    matched_transaction_id: null,
-    match_confidence: null,
-    match_method: null,
-    match_reasoning: null,
     correlation_id: null,
     created_at: '2024-06-15T14:30:00Z',
     updated_at: '2024-06-15T14:30:00Z',