fix: validate classic SAP object workflows and simulator

[Augusto42]

What changed

• adds a localhost-only SAP ADT/ZADT_VSP protocol simulator
• makes AMDP and abapGit services optional so the APC handler activates on classic non-HANA systems
• fixes dynamic RFC table creation used by real Dynpro reads
• resolves classic HOOK_IMPL source includes through ENHINCINX for ENHO reads
• sends the ADT objectType filter to the server so filtered searches respect --max
• fixes generic .abap content detection for programs and includes
• exposes create/update/upsert metadata flags in vsp source write
• improves installer syntax diagnostics

Why

The object-type expansion worked in isolated mocks but uncovered compatibility gaps on an SAP NetWeaver 7.52 learning system. In particular, optional HANA/abapGit classes blocked the APC handler, DDIC table types were wrapped incorrectly for RFC calls, classic enhancement includes may use padded technical names, and CLI type filtering happened after ADT had already limited the page.

Impact

The fork can now install its core bridge on classic SAP systems and perform read-only Dynpro and Enhancement workflows more reliably. Optional domains are advertised only when their services are actually available.

Validation

• go test ./...
• go vet ./...
• go build ./cmd/vsp
• localhost-only mock SAP end-to-end coverage
• real local SAP 7.52 lab: Dynpro read returned header and flow logic
• real local SAP 7.52 lab: ENHO read resolved the padded source include
• real local SAP 7.52 lab: search '*' --type ENHO --max 10 returned 10 typed results
• git diff --check

All fixtures are synthetic, and the live validation used only standard SAP learning-system objects. No customer data or credentials are included.