refactor: convert to bun workspaces monorepo

- Move web app into apps/web/
- Create packages/shared/ with shared types
- Create plugins/decky-vault/ scaffold
- Root package.json manages workspaces only

apps/web/drizzle/0011_rename-handled-to-handheld-add-image.sql

@@ -0,0 +1,5 @@
+-- Rename pg_enum value from 'handled' to 'handheld'
+ALTER TYPE device_type RENAME VALUE 'handled' TO 'handheld';
+
+-- Add nullable image column to hardware table
+ALTER TABLE hardware ADD COLUMN image text;