🛡️ Sentinel: [HIGH] Add security headers and strict CORS

[seonghobae]

🚨 Severity: HIGH
💡 Vulnerability: The Fastify API was lacking default security headers and a strict CORS policy. This left the server vulnerable to common attacks such as Cross-Site Scripting (XSS), Clickjacking, and improper cross-origin access.
🎯 Impact: Without security headers, browsers might fall victim to MIME-sniffing attacks or render the app in a malicious iframe. An absent or overly permissive CORS policy (like origin: true) would reflect arbitrary origins and allow unauthorized cross-origin requests.
🔧 Fix: Integrated @fastify/helmet@11.x and @fastify/cors@8.x into apps/api/src/http/server.ts. Configured helmet globally and configured cors to strictly read from VSPEC_ALLOWED_ORIGINS (falling back to false securely if empty) to prevent reflective origins.
✅ Verification: Ran pnpm lint, pnpm --filter @vooster/api run typecheck, and pnpm --filter @vooster/api run test.

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PR created automatically by Jules for task 2944517857776595814 started by @seonghobae

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Run ID: 5e66e131-3219-4897-a164-e554500ebfed

📥 Commits

Reviewing files that changed from the base of the PR and between cb2b2da and c26dd59.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (3)

• .jules/sentinel.md
• apps/api/package.json
• apps/api/src/http/server.ts

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[seonghobae]

통합 PR에서 유효 변경만 선별해 다시 다루고 있어 이 중복/잔여 PR은 정리합니다. #39 및 vibemafiaclub/vooster#34를 기준으로 후속 검토를 진행합니다.