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b40217c7fe
Prevent savedata corruption and denial-of-service by adding four layers of protection to the save pipeline: - Bounded decompression (nullcomp.DecompressWithLimit): caps output size to prevent OOM from crafted payloads that expand to exhaust memory - Bounds-checked delta patching (deltacomp.ApplyDataDiffWithLimit): validates offsets before writing, returns errors for negative offsets, truncated patches, and oversized output; ApplyDataDiff now returns original data on error instead of partial corruption - Size limits on save handlers: rejects compressed payloads >512KB and decompressed data >1MB before processing; applied to main savedata, platedata, and platebox diff paths - Rotating savedata backups: 3 slots per character with 30-minute interval, snapshots the previous state before overwriting, backed by new savedata_backups table (migration 0007)