TekH f8690b9417 docs: Add AGENTS.md architecture guidance for AI agents
Comprehensive architecture documentation including:

  - Clean Architecture with Controller-based API (NOT Minimal API)

  - Vertical slice architecture pattern

  - Exception-based error handling (no Result<T>)

  - Feature-driven development approach

  - Primary constructor coding standards

  - Git commit guidelines

  - Swiss QR Bill backward compatibility decisions

Key decisions documented:

  - Windows-only targeting (no Linux support needed)

  - Support BOTH multipart/form-data AND Base64 JSON

  - Separate endpoints for Combined Address (K-Type) legacy support

  - Multi-tenancy deferred until after all sync features complete
2026-07-07 19:00:12 +02:00
2026-06-12 13:38:44 +02:00
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