fix(pr-review): bind the GitHub App slug on maple-ai so reviews mention the real bot

[Makisuo]

Published reviews still said "mention @maple to ask about one" after #1162.

The review comment is published from the maple-ai Worker, but `GITHUB_APP_SLUG` was only bound on api. On maple-ai the slug was always missing, so `reviewerMention` fell back to `@maple`.

Moves `GITHUB_APP_SLUG` into `githubAppSourceEnv`, which both Workers bind, and drops the api-only copy.

Existing review comments pick up the right handle on the PR's next push.

🤖 Generated with Claude Code

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[maple-review-bot]

Maple review

🟢 Confidence 5/5 · safe to merge
One key moved between two deploy-time groups; api still binds it through githubAppSourceEnv, so only maple-ai gains a binding.
_{quality 100/100 · no findings · tests not needed · risk low}

Moves GITHUB_APP_SLUG from api's own env list into the shared githubAppSourceEnv group, so maple-ai — which publishes PR reviews — binds the App slug and reviewerMention stops falling back to @maple. Safe to merge.

• githubAppSourceEnv now binds GITHUB_APP_SLUG alongside app id and key
• apps/api drops its own api-only optionalPlain("GITHUB_APP_SLUG")

What was checked

• api keeps the slug: apiConfiguredEnv still spreads githubAppSourceEnv (apps/api/src/resources/env.ts:107)
• reviewerMention (packages/domain/src/http/pr-review.ts:739) trims the slug and falls back on empty, so a blank binding is safe
• maple-ai's configuredEnv already spreads githubAppSourceEnv (apps/ai/src/worker.ts:123), so alchemy binds the new key there

_{4e4afbf · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple to ask about one.}

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• apps/api/src/resources/env.ts
• packages/infra/src/env.ts

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