feat(bindings): `put_documents` / `add_documents` across python, nodejs, wasm, ruby, php (#551 PR-4)

[mosuka]

Sub-issue of #551 (PR-4 of the batch-ingestion campaign). Depends on PR-1 (#863).

Scope

Add put_documents / add_documents next to the existing singular methods in all five bindings, following each binding's search_batch array-marshalling precedent (python laurus-python/src/index.rs, nodejs, wasm, ruby, php). Surface the BatchIngest error fields (failed_index, failed_id, applied) in each language's exception message. One smoke test per binding. Binding doc pages updated (en+ja).

Acceptance criteria

• All five bindings expose both methods with per-binding smoke tests
• Error surfaces position + applied count
• wasm check passes; binding docs updated, markdownlint clean

Closes #551 (final PR of the campaign). Refs #551