feat(graphql): implement GraphQL APQ based on Redis

[pan93412]

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[linear]

DBP-62 Implement APQ of GraphQL

[Copilot]

Pull Request Overview

This PR implements Apollo Client's Automatic Persisted Queries (APQ) functionality using Redis as the backend cache, replacing the previous in-memory LRU cache implementation.

• Introduces a new Redis-based APQ cache implementation in the internal/graphql/apq package
• Updates the GraphQL handler to use the Redis cache instead of an in-memory LRU cache
• Integrates the new APQ cache into the dependency injection system

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
internal/graphql/apq/apq.go	New Redis-based APQ cache implementation with Get/Add methods
cmd/backend/server.go	Adds ApqCache to the dependency injection providers
cmd/backend/dependencies.go	Creates ApqCache provider and updates GqlgenHandler to use Redis cache

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[Copilot]

Pull Request Overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

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