test(03-01): add failing tests for setup backend

- Add setups and setupItems tables to DB schema
- Add Zod schemas for setup create/update/sync
- Add Setup/SetupItem types to shared types
- Add setup tables to test helper
- Write service and route tests (RED - no implementation yet)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/db/schema.ts

@@ -63,6 +63,27 @@ export const threadCandidates = sqliteTable("thread_candidates", {
     .$defaultFn(() => new Date()),
 });
 
+export const setups = sqliteTable("setups", {
+  id: integer("id").primaryKey({ autoIncrement: true }),
+  name: text("name").notNull(),
+  createdAt: integer("created_at", { mode: "timestamp" })
+    .notNull()
+    .$defaultFn(() => new Date()),
+  updatedAt: integer("updated_at", { mode: "timestamp" })
+    .notNull()
+    .$defaultFn(() => new Date()),
+});
+
+export const setupItems = sqliteTable("setup_items", {
+  id: integer("id").primaryKey({ autoIncrement: true }),
+  setupId: integer("setup_id")
+    .notNull()
+    .references(() => setups.id, { onDelete: "cascade" }),
+  itemId: integer("item_id")
+    .notNull()
+    .references(() => items.id, { onDelete: "cascade" }),
+});
+
 export const settings = sqliteTable("settings", {
   key: text("key").primaryKey(),
   value: text("value").notNull(),