Docs: reference mfr_interface_description.md + Fuchs_Database

- ARCHITECTURE.md: add Fuchs_Database (SSDT) and the MFR interface doc to the
  project table; new MFR ERP Integration and Database sections.
- copilot-instructions.md + CLAUDE.md (kept in sync): add MFR ERP integration
  and Database sections pointing to MFR_RESTClient/Docs/mfr_interface_description.md
  as the contract to read before changing the client; CLAUDE.md doc map updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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- `FdsInvoiceData` / `FdsReminderData` are **pure data holders** (parse + properties). Loading, persistence and PDF generation belong in the services — never `Task.Run(...).Wait()` sync-over-async.
- Data access stays SQL-first via OCORE helpers (`getSQLDataSet_async`, `setSQLValue_async`) + stored procedures; no EF Core.
## MFR ERP integration
- `MFR_RESTClient` talks to the **mfr (Mobile Field Report)** ERP over REST/OData. Its contract (base URLs, auth, OData conventions, pagination, error/retry, deep-create + document-upload) is documented in **`MFR_RESTClient/Docs/mfr_interface_description.md`** — **read it before changing the client**.
- The client uses HTTP Basic auth, a configurable timeout, and retries idempotent GETs on transient errors (429/5xx, network/timeout) with backoff. Create clients via `IMfrClientFactory` (don't `new` them). The legacy VB project files have been removed; the active project is `MFR_RESTClient.csproj`.
## Database
- The SQL schema source of truth is the **`Fuchs_Database`** SSDT project. The backend is SQL-first (stored procedures, table types like `fds__tt__bankingtransactions`, functions via OCORE helpers — no EF Core).
- When you change a stored proc name/params or a table type, update **both** the SSDT project and the calling C# in the same change. Verify every `[dbo].[…]` the backend calls actually exists in `Fuchs_Database`.
## Bank statement parsing (MT940 + CAMT)
- Two parsers feed the same banking pipeline: the external `MT940Parser` (SWIFT text) and the in-repo **`CAMTParser`** project (ISO 20022 camt.052/053/054 XML).
- `BankingService.ParseToDatatable` **auto-detects** the format (XML → CAMT, else MT940) and maps both into the `fds__tt__bankingtransactions` schema. The `bam/up` handler and the frontend file picker accept both (`.sta/.mt940/.txt` and `.xml/.camt`).