Build SpacesOps StartOS package (v1.0.0:0)

Initial .s9pk for SpacesOps, targeting StartOS 0.4.0.x with SDK 1.5.1.

- Single managed daemon from spacesops/spacesops:v1.0.0 (x86_64 + aarch64),
  keeping the image entrypoint (/app/docker-entrypoint.sh node server.js).
  Forces PLATFORM_HOST=0.0.0.0 / PLATFORM_PORT=7264 so the StartOS proxy can
  reach the app. Single `ui` interface on 7264.
- Depends on the Spaces service (>=0.0.9:3) and auto-wires the spaced RPC creds:
  main.ts mounts the Spaces `main` volume read-only at /spaces-data, execs a
  read of its store.json inside the subcontainer, and injects SPACED_RPC_USER/
  PASSWORD + SPACED_RPC_URL=http://spaces.startos:7225. Throws to retry until
  Spaces is installed and seeded.
- Generates a Nostr operator keypair (nostr-tools, bundled by ncc) and a strong
  session secret in idempotent init tasks (.once() reads, allowWriteAfterConst
  merges). Actions: show-operator-credentials, import-operator-key,
  show-admin-credentials (surfaces the fixed admin/Whatever! login with a
  warning), configure-platform (optional relay/mode/CoinGecko/SUBSD).
- Install alert warns to install Spaces first and about the fixed admin
  credential. Backs up the `main` volume.
- Icon: icon.svg (source spacesops.svg). The `spaces` dependency uses
  assets/spaces-icon.png for its Marketplace metadata.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

startos/nostr.ts

@@ -0,0 +1,25 @@
+import { getPublicKey, nip19 } from 'nostr-tools'
+
+const HEX64 = /^[0-9a-f]{64}$/
+
+function toBytes(secretHex: string): Uint8Array {
+  return Uint8Array.from(Buffer.from(secretHex.trim().toLowerCase(), 'hex'))
+}
+
+export function isValidSecretHex(hex: string): boolean {
+  return HEX64.test(hex.trim().toLowerCase())
+}
+
+// Deterministic secp256k1 x-only public key derivation (no randomness). Throws
+// if the secret is not a valid curve scalar.
+export function secretHexToPublicHex(secretHex: string): string {
+  return getPublicKey(toBytes(secretHex))
+}
+
+export function encodeNpub(publicHex: string): string {
+  return nip19.npubEncode(publicHex)
+}
+
+export function encodeNsec(secretHex: string): string {
+  return nip19.nsecEncode(toBytes(secretHex))
+}