style(project): format Go with gofmt, set up Prettier for the frontend

Run gofmt -w across the backend, normalising the manually-aligned := blocks
to the gofmt standard. No code behaviour changes.

Add Prettier (+ prettier-plugin-svelte) to the frontend with the SvelteKit
default config (tabs, single quotes) so formatting is reproducible, then run
it over the whole tree. Add format / format:check npm scripts and a
.prettierignore (build output, generated schema.ts, static assets).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/internal/domain/acl.go

@@ -10,10 +10,10 @@ type ObjectType struct {
 
 // Permission represents a per-object access entry for a user.
 type Permission struct {
-	UserID        int16
-	UserName      string // denormalized
-	ObjectTypeID  int16
-	ObjectID      uuid.UUID
-	CanView       bool
-	CanEdit       bool
+	UserID       int16
+	UserName     string // denormalized
+	ObjectTypeID int16
+	ObjectID     uuid.UUID
+	CanView      bool
+	CanEdit      bool
 }