Add user-service (NATS request/reply) + consolidate user endpoints + frontend migration#279

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amdla wants to merge 15 commits into

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claude/cool-davinci-6lYhU

Commits on Jun 8, 2026

docs(user-service): design specs, plans, and client-api contract
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feat(pkg): user subjects, subscription/status models, user error codes
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feat(frontend,loadgen): migrate to consolidated subscription.list contract
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feat(user-service): config, request/response DTOs, service wiring, mocks
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feat(user-service): mongo repository + integration tests
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feat(user-service): room RPC client + outbox publisher adapters
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feat(user-service): status/app/subscription handlers + room enrichment
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feat(user-service): main wiring, metrics server, deploy manifests
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chore: remove mock-user-service; wire user-service into local compose
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fix(user-service): round-2 review fixes — disk-use, unread cap, error relay
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docs(user-service): record round-2 review decisions in plan
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docs(user-service): fix spec markdownlint + add getByRoomID to handler enumeration
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fix(frontend): stamp X-Request-ID on sync NATS requests
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fix(user-service,room-service): make shared-collection unique indexes agree
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ci: re-trigger integration suite (flaky loadgen pacer perf test)
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