libSceVnaInternal technical debt

VnaInternal inventory exports - 84 names and NIDs are present in the PS5 13.60 export inventory. Parameter lists, return types and behavior are unverified; the parameterless int declarations are import-resolution placeholders, not verified ABI contracts. Every entry throws through NotImplemented_nid_no_patch. Four additional inventory NIDs remain unresolved and are not declared. No voice-network-agent behavior is implemented. Closed PR #10672 used a PS4-only source for 27 VnaInternal declarations; none of that source is evidence for this entry, and the 21 repeated identities here are independently present in the pinned PS5 13.60 records.