Resolve merge conflict in PR #8: keep newer pure ASGI middleware implementation

[Copilot]

PR #8 and a separate hotfix on main (17ab592) independently replaced BaseHTTPMiddleware with a pure ASGI middleware in backend/app/middleware.py, creating a merge conflict. The PR branch version is 5 minutes newer and more complete — it is kept as the resolved state.

Conflict

Branch	Commit	Time (UTC)	Notes
main	17ab592	20:40	Simpler; handles http+websocket; manual header list; status_code = 0 default
PR #8	f728bb1	20:45	Uses MutableHeaders; http-only; status_code = 500 default; fuller docstring

Resolution: keep PR #8's version

# PR version (kept) — uses MutableHeaders and correct 500 default
status_code: int = 500

async def send_wrapper(message: Message) -> None:
    nonlocal status_code
    if message["type"] == "http.response.start":
        status_code = message["status"]
        headers = MutableHeaders(scope=message)
        headers.append("X-Request-ID", request_id)
    await send(message)

• backend/tests/test_auth_methods.py — identical on both branches; no conflict
• .github/workflows/docker.yml — PR version retained (adds ENCRYPTION_KEY to CI env)
• All new files from PR feat(phase7): add integration hardening — E2E tests, security validation, deployment docs #8 (E2E/migration/performance/security tests, deployment/operations/security docs) are intact

Original prompt

Pull Request: #8

Resolve the code conflict by using the most recent code change and ignore the older ones

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[Copilot]

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