fix: rename all packages from @mosaic/* to @mosaicstack/*

- Updated all package.json name fields and dependency references
- Updated all TypeScript/JavaScript imports
- Updated .woodpecker/publish.yml filters and registry paths
- Updated tools/install.sh scope default
- Updated .npmrc registry paths (worktree + host)
- Enhanced update-checker.ts with checkForAllUpdates() multi-package support
- Updated CLI update command to show table of all packages
- Added KNOWN_PACKAGES, formatAllPackagesTable, getInstallAllCommand
- Marked checkForUpdate() with @deprecated JSDoc

Closes #391

packages/brain/src/conversations.ts

@@ -1,4 +1,4 @@
-import { eq, and, asc, desc, ilike, type Db, conversations, messages } from '@mosaic/db';
+import { eq, and, asc, desc, ilike, type Db, conversations, messages } from '@mosaicstack/db';
 
 /** Maximum number of conversations returned per list query. */
 const MAX_CONVERSATIONS = 200;