unhardcode banned races

[Pospelove]

follow up #1805

[Pospelove]

@ellipsis-dev plan

[ellipsis-dev]

🚀	This implementation plan was created by @ellipsis-dev

Tag me (@ellipsis-dev) in a comment with guidance if you want me to replan or to implement this plan.

Implementation Plan

Step 1: Implement race ban check

Path: skymp5-client/src/sync/appearance.ts
In applyAppearanceCommon, check isRaceBanned(raceId) before setting NPC race. Implement isRaceBanned(raceId: number): boolean to read from config/bannedRaces.json.

Step 2: Create banned races JSON

Path: config/bannedRaces.json
Create config/bannedRaces.json with an array of banned race IDs, e.g., [1, 2, 3].

Step 3: Read banned races from JSON

Path: skymp5-client/src/sync/appearance.ts
In isRaceBanned, use fs.promises.readFile to read config/bannedRaces.json. Parse with JSON.parse. Handle file I/O and JSON errors. Return true if raceId is in the parsed array, else false.

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