andgineer / dinary / 29629336073

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Support Montenegro fiscal receipts

Scan and process Montenegrin EFI receipts alongside Serbian ones. The
country is detected from the QR URL host, with no user-facing switch.

- Add a Montenegrin parser that reads amount/date from the verify URL
  (params after the `#` fragment; restores the `+` offset mangled to a
  space) and fetches full contents from the tax authority's verifyInvoice
  service, reusing the transient/permanent/not-indexed error taxonomy.
- Move the shared parsed-receipt/item structures and error types into a
  dependency-free receipt_types module; add a dispatch layer that picks
  the parser and the receipt currency (RSD vs EUR) by URL host.
- Persist and manual-resolution flows now derive the receipt currency
  per receipt instead of assuming RSD; EUR amounts convert to the
  accounting currency through the existing exchange-rate path.
- Frontend recognizes the Montenegrin hosts and decodes prc/crtd,
  reporting EUR in the queue and flush toasts.
- Fixture-driven parser tests captured from a real receipt, plus dispatch,
  currency, and manual-resolution coverage; frontend host/decoding tests.
- Update receipt-fetching and architecture specs; remove the plan file.

Closes #23

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HJfBtjN6ktrwnZJkiRe6Rg

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