chore: migrate to start-sdk 2.0 and bump Bunker46 to latest upstream (0.1.0:3)

[helix-nine]

start-sdk 2.0 migration

Migrates this package to @start9labs/start-sdk 2.0 (requires StartOS 0.4.0-beta.10).

Changes

• SDK pin → 2.0.1, TypeScript → ^6, tsconfig.json extends the shipped tsconfig.base.json, Makefile includes the SDK's s9pk.mk (vendored copy removed), reusable CI workflows repointed to Start9Labs/start-technologies.
• 2.0 API migrations as applicable: sdk.serviceInterface.* → sdk.host.* resolved over the LXC bridge, lazy SubContainer, alerts manifest field removed, and other ### Changed / ### Removed items from the SDK 2.0 changelog.

Upstream bump

Bunker46 pins upstream by git commit (BUNKER46_REF in Dockerfile.server / Dockerfile.web) because dsbaars/bunker46 publishes no releases. Advanced the pin from 387d8a6 to 1a9c6c3 (latest main):

• Server survives transient relay crashes + adds a restart policy for improved resilience (#20).
• Upstream diff: dsbaars/bunker46@387d8a6...1a9c6c3

The upstream app version is unchanged (0.1.0), so this is a revision bump: StartOS version 0.1.0:2 → 0.1.0:3, with release notes updated in all five locales. No state migration is required for existing installs.

Test plan

• CI build is green (npm ci → tsc → SDK lint → ncc → s9pk pack).
• Install the built 0.1.0:3 .s9pk on a StartOS 0.4.0-beta.10 server (fresh install and, separately, an upgrade over an existing 0.1.0:2 install).
• Start the service; confirm all four daemons come up (bunker46-db, bunker46-valkey, bunker46-server, bunker46-web) and the service reaches its health check and its ui interface loads.
• Exercise the NIP-46 flow: create/connect a bunker signer through the web UI and confirm the server signs a request.
• Kill/restart a connected relay (or restart the server subcontainer) and confirm the server recovers rather than staying down — the behavior this upstream bump targets.
• Run a backup/restore (Postgres withPgDump) and confirm the dump is non-empty and restores cleanly.

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