feat(workspaces): rename @gsd/* scope to @hyveon/* (incl. server → desktop-main)

[CoderCoco]

Child of #135 (epic: Electron shell + build pipeline). Authoritative scope in the design spec.

Broadened during the Hyveon rebrand (#212). Originally just renamed @gsd/server → @gsd/desktop-main; now covers the full workspace-scope migration to align with the new brand. The rebrand PR intentionally left @gsd/* alone because renaming the scope touches every TypeScript import in the tree, and that work was already planned to ride here.

Scope

Rename every workspace under the @gsd/* scope to @hyveon/*. Concrete moves:

Old	New	Notes
app/packages/server (@gsd/server)	app/packages/desktop-main (@hyveon/desktop-main)	The original scope of this issue. Becomes the Electron main-process package.
app/packages/web (@gsd/web)	app/packages/web (@hyveon/web)	Directory unchanged; package name only.
app/packages/shared (@gsd/shared)	app/packages/shared (@hyveon/shared)	Same.
app/packages/lambda/interactions (@gsd/lambda-interactions)	@hyveon/lambda-interactions	Same for the four Lambda packages.
app/packages/lambda/followup (@gsd/lambda-followup)	@hyveon/lambda-followup
app/packages/lambda/update-dns (@gsd/lambda-update-dns)	@hyveon/lambda-update-dns
app/packages/lambda/watchdog (@gsd/lambda-watchdog)	@hyveon/lambda-watchdog
scripts (@gsd/scripts)	@hyveon/scripts
(new in Epic C — #168)	@hyveon/cloud-aws	Land directly under the new scope; never under @gsd/*.
(new in Epic A — #143)	@hyveon/desktop-preload	Land directly under the new scope.

Plus:

• Update every import { … } from '@gsd/…' across the tree to '@hyveon/…'.
• Update npm-workspaces references in the root package.json scripts (e.g. -w game-server-manager).
• Update CLAUDE.md, the design spec, and any doc that mentions @gsd/*.

Acceptance

• All workspace name fields in app/packages/**/package.json start with @hyveon/.
• Zero imports remain referencing @gsd/* (confirmed via grep -r "@gsd/" --include="*.ts" --include="*.tsx" --include="*.json").
• npm install and npm run app:build succeed under the new names.
• npm run app:test passes unchanged.
• ESLint and TypeScript compile clean.
• CLAUDE.md and the design spec updated to use the new scope.