Order endpoint caching (depends on #54)

[alastairong1]

Summary

• Wraps get_orders_by_address and get_orders_by_token handlers with AppCache lookups (15s TTL, 1000 capacity)
• Adds OrdersByOwnerCache and OrdersByTokenCache types with constructors
• Adds Copy, PartialEq, Eq, Hash derives to OrderSide for use as cache key
• Adds From<Arc<ApiError>> impl for cache error conversion
• Registers caches as Rocket managed state

Dependencies

• Blocked on PR Add in-process endpoint caching with moka #54 which provides AppCache, CacheGroup, and moka dependency

Test plan

• Second request to same endpoint within 15s returns in <100ms
• Different page/page_size params get separate cache entries
• Cache expires after 15s TTL

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