v1.6.5: fix attendance unique constraint, schema sync, seed script

- Change attendance idx_attendance_user_date from unique to index (allow multiple shifts per day)
- Reset migrations to single baseline init migration
- Add seed script with admin user (admin/admin)
- Update CLAUDE.md with migration workflow documentation
- Various frontend fixes (queries, pages, hooks)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/routes/admin/company-settings.ts

@@ -99,7 +99,7 @@ export default async function companySettingsRoutes(
   // POST /api/admin/company-settings/logo?variant=light|dark
   fastify.post(
     "/logo",
-    { preHandler: requirePermission("settings.manage") },
+    { preHandler: requirePermission("settings.company") },
     async (request, reply) => {
       const query = request.query as Record<string, string>;
       const variant = query.variant === "dark" ? "dark" : "light";
@@ -333,7 +333,7 @@ export default async function companySettingsRoutes(
   // GET /api/admin/company-settings/system-info
   fastify.get(
     "/system-info",
-    { preHandler: requirePermission("settings.manage") },
+    { preHandler: requirePermission("settings.company") },
     async (request, reply) => {
       // eslint-disable-next-line @typescript-eslint/no-var-requires
       const pkg = require("../../../package.json") as { version: string };
@@ -404,7 +404,7 @@ export default async function companySettingsRoutes(
 
   fastify.put(
     "/",
-    { preHandler: requirePermission("settings.manage") },
+    { preHandler: requirePermission("settings.company") },
     async (request, reply) => {
       const parsed = parseBody(UpdateCompanySettingsSchema, request.body);
       if ("error" in parsed) return error(reply, parsed.error, 400);