CONV-296: Create API key generation service

[menvil]

Summary

• Adds ApiKeyGenerator service that generates a fc_ prefixed token, stores only SHA-256 hash
• Adds GeneratedApiKey DTO with apiKey model and plainToken (shown once, not stored)

Test plan

• Token starts with fc_
• Hash in DB matches hash('sha256', plainToken)
• Plain token not stored in DB
• composer test passes (541 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds an ApiKeyGenerator service to create user API keys with fc_-prefixed tokens while storing only a SHA-256 hash. Returns a GeneratedApiKey that includes the ApiKey model and a one-time plainToken, fulfilling CONV-296 security requirements.

• New Features
  • ApiKeyGenerator::create(User $user, string $name) returns GeneratedApiKey.
  • Tokens are random 64 chars with fc_ prefix; only token_hash (sha256) is stored.
  • Keys are linked to the user and named; plain token is never persisted and shown once.

^{Written for commit 7a0cfba. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-296-create-api-key-generation-service

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