Update to @start9labs/start-sdk 2.0.9

Targets StartOS 0.4.0-beta.10 (was beta.9). Four breaking changes applied:

- Service interfaces moved onto their binding: sdk.serviceInterface.getOwn is
  gone, so nacho's EXPO_PUBLIC_API_BASE_URL now walks the subs-api interface off
  its host with sdk.host.getOwn, using the map selector so .const() re-runs only
  when that interface's address changes.
- SubContainer.of is lazy and synchronous — dropped the awaits.
- Task input split into accept/set; the Bitcoin RPC task accepts the credentials
  it sets, matching its previous behavior.
- The manifest alerts field was removed (ours was all null).

Also adopts the build plumbing the SDK now ships instead of vendoring it: the
Makefile includes node_modules/@start9labs/start-sdk/s9pk.mk, tsconfig extends
the SDK's base (ES2022, bundler resolution), and TypeScript moves to 6.0.

Verified by installing on a StartOS box: all daemons come up, nacho logs a
derived API base URL rather than the loopback fallback, and the sync health
check's space-cli exec runs on cadence against the shared subcontainer.

Co-authored-by: Cursor <cursoragent@cursor.com>

tsconfig.json

@@ -1,11 +1,4 @@
 {
-  "include": ["startos/**/*.ts", "node_modules/**/startos"],
-  "compilerOptions": {
-    "target": "ES2018",
-    "module": "CommonJS",
-    "moduleResolution": "node",
-    "esModuleInterop": true,
-    "strict": true,
-    "skipLibCheck": true
-  }
+  "extends": "@start9labs/start-sdk/tsconfig.base.json",
+  "include": ["startos/**/*.ts", "node_modules/**/startos"]
 }