fix(basket): use direct delivery when self-hosting

[izadoesdev]

SELFHOST=true makes Basket, Links, and Uptime operate without Kafka, even when copied environment settings contain a broker. Links reuses its acknowledged ClickHouse fallback; Uptime writes directly to ClickHouse through its existing durable delivery worker. Health checks follow the active dependencies.

Hosted Kafka behavior and protection against ambiguous delivery retries are preserved. Uptime direct delivery is at least once: failed writes retry, and a timeout can produce a duplicate. No schema changes or new services.

Validation: Basket 507, Links 27, and Uptime 58 tests; root lint and all 33 typecheck tasks; pre-push tests. Combined self-host smoke verified all three health endpoints with an invalid broker, a real synthetic Uptime write/read, and HTTP 503 from all three when ClickHouse stopped.

Depends on #806 for SELFHOST forwarding through Turbo. Complements #804 and #805. Overlaps #721 only in Links producer/tests; based directly on staging, with no code taken from that feature branch.

---

Summary by cubic

When SELFHOST=true, Basket, Links, and Uptime deliver directly to ClickHouse and ignore copied broker settings; health checks follow the active delivery path and hosted Kafka behavior is unchanged.

• Basket marks Redpanda disabled instead of checking it, so it no longer degrades overall health; Uptime pings ClickHouse in self-host mode.
• Uptime writes with async insert off and a 10s timeout; in self-host mode, failed delivery jobs stay pending past the retry limit until storage recovers instead of being dropped.
• Links reuses its acknowledged ClickHouse fallback.
• Delivery stays at least once, so a timeout can duplicate an Uptime write; no schema changes or new services are required.

^{Written for commit 70d20cb. Summary will update on new commits.}

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; no blocking or non-blocking actionable issues remain.

Summary

This PR makes Basket, Links, and Uptime bypass Kafka when self-hosting and aligns their health checks with the active delivery dependencies. The latest changes also resolve both previous review findings.

• Basket and Links use direct ClickHouse delivery when SELFHOST=true, even if broker configuration remains present.
• Uptime directly inserts completed checks into ClickHouse and reports ClickHouse health in self-hosted mode.
• Failed self-hosted Uptime deliveries are returned to BullMQ’s delayed set indefinitely until storage recovers.
• Hosted Kafka delivery and its bounded retry policy remain unchanged.
• The Basket test now uses a properly typed Kafka producer instead of casting through unknown.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    A[Accepted event or completed uptime check] --> B{SELFHOST}
    B -->|true| C[Direct ClickHouse delivery]
    B -->|false| D[Kafka / Redpanda]
    D --> E[ClickHouse]
    C -->|Uptime failure| F[BullMQ delayed job]
    F -->|30-second retry| C
    C -->|success| G[Durable analytics history]
    E --> G

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[izadoesdev]

@greptileai review this