docs(capability-matrix): add specs for database and storage auto_retry

[grdsdev]

Adds spec files for two existing feature IDs that had none:

• database.configuration.auto_retry — the fixed postgrest-js rule: GET/HEAD only, 503/520 only, 4 attempts, a per-client switch and a per-request override of that switch, and nothing else configurable. Full-jitter capped backoff, Retry-After honoured up to the cap, stop on cancellation, X-Retry-Count on replays, and no retry of errors thrown by caller-supplied code.
• storage.configuration.auto_retry — the configurable counterpart: idempotent methods (or any method with an Idempotency-Key), the transient status set including Cloudflare 520–524/530, a configurable attempt count with 1 meaning off, and the rule that a one-shot upload body is never replayed.

Both describe observable behavior only, per CONTRIBUTING. npm run validate passes (OK — capability matrix is valid.).

Written alongside the Swift implementation in supabase/supabase-swift#1341, which declares both features implemented in its sdk-compliance.yaml. Linear: SDK-1791.

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