fix(api): bound and dedupe blob sidecar indices#248
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The blob sidecars endpoint accepted an unbounded number of
indicesquery parameters and honored duplicates, so a single small request could ask for the same ~128KB sidecar tens of thousands of times. The full response is built in memory before writing, which made this an easy way for an unauthenticated client to force multi-GB allocations.indicesis now treated as a bounded set: duplicates are collapsed, values are capped at 1024 per request, and negative values return a 400 instead of a 500.