Restore AppLockService to wrap acquireApObjectLock

[Copilot]

What

Restores AppLockService as a DI-based wrapper around the distributed lock functions, replacing direct acquireApObjectLock calls in AP services.

• Created AppLockService.ts with getApLock() and getChartInsertLock() methods
• Updated ApNoteService and ApInboxService to use AppLockService instead of injecting Redis directly
• Registered service in CoreModule.ts

Before:

constructor(
  @Inject(DI.redis) private redisClient: Redis.Redis,
) {}

const unlock = await acquireApObjectLock(this.redisClient, uri);

After:

constructor(
  private appLockService: AppLockService,
) {}

const unlock = await this.appLockService.getApLock(uri);

Why

Per @syuilo's request: cleaner implementation with Redis instance managed via DI rather than passed manually to lock functions. Services needing AP object locking no longer need direct Redis injection.

Additional info (optional)

Build verified. No new security issues (CodeQL clean).

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

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