feat(profiles): add profile repository

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/integration/profile-repository.test.ts

@@ -0,0 +1,34 @@
+import { describe, it, expect } from 'vitest';
+import { openInMemoryForTest } from '../../src/lib/server/db';
+import {
+  createProfile,
+  listProfiles,
+  renameProfile,
+  deleteProfile
+} from '../../src/lib/server/profiles/repository';
+
+describe('profile repository', () => {
+  it('creates, lists, renames, deletes', () => {
+    const db = openInMemoryForTest();
+    const p = createProfile(db, 'Hendrik', '👨‍🍳');
+    expect(p.id).toBeGreaterThan(0);
+    expect(listProfiles(db).length).toBe(1);
+
+    renameProfile(db, p.id, 'Hendrik S.');
+    expect(listProfiles(db)[0].name).toBe('Hendrik S.');
+
+    deleteProfile(db, p.id);
+    expect(listProfiles(db).length).toBe(0);
+  });
+
+  it('rejects duplicate names', () => {
+    const db = openInMemoryForTest();
+    createProfile(db, 'Hendrik');
+    expect(() => createProfile(db, 'Hendrik')).toThrow();
+  });
+
+  it('rejects empty name', () => {
+    const db = openInMemoryForTest();
+    expect(() => createProfile(db, '   ')).toThrow(/empty/i);
+  });
+});