Implements FloatDB Gateway for Rank Fetching

[Step7750]

Overview

Switches to using the gateway.floatdb.com service to lookup ranks for items. There's been a decent chunk of optimization to reduce needless calls, such as using a threshold blob to determine whether an item qualifies for a rank.

Changes

• Pre-filters rank lookups with a locally cached threshold copy
• Eagerly fetches ranks when possible to reduce the amount of total calls to the gateway
  • Note: This only applies when visiting a Steam profile inventory, notably excluding the trade inventory page
  • Batches rank lookups within 100ms debouncing periods to similarly prevent many calls
• Refactors implementation of the float fetcher service since it doesn't need a queue model anymore
  • Fixes previous issues with deduplicating in flight requests and returning cached items
• Switches to primarily use a new FetchInspectInfoBatch bridge method since the overhead of sending 100+ messages to the service worker to check ranks would exceed the rank batcher debounce interval.

Ref CSF-1165

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Note

Medium Risk
Introduces new networked rank-check and threshold-fetch flows plus request batching/deduping, which could affect item metadata/rank display correctness and increase reliance on the new gateway endpoints.

Overview
Switches rank lookups to the FloatDB Gateway (environment.floatdb_gateway_url) and adds client-side rank-check batching plus local threshold caching to reduce unnecessary rank requests.

Refactors float/inspect fetching to require asset_id and to batch bridge calls via a new FETCH_INSPECT_INFO_BATCH handler; FloatFetcher now microtask-batches, de-dupes in-flight requests, and caches results by asset.

Adds eager prefetching of floats/ranks when inventory asset properties load, and updates market/inventory components to pass asset_id (removing the previous list-price-based fetch path).

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