harden(plan): 92-day range cap + dedup user_ids on bulk create

src/__tests__/plan.test.ts

@@ -909,6 +909,20 @@ describe("plan.service.bulkCreateEntries", () => {
     );
     expect("error" in empty && empty.status).toBe(400);
 
+    const tooLong = await bulkCreateEntries(
+      {
+        user_ids: [adminUserId],
+        date_from: "2096-01-01",
+        date_to: "2096-12-31", // > 92 days
+        include_weekends: true,
+        project_id: null,
+        category: "work",
+        note: `${N}x`,
+      },
+      adminUserId,
+    );
+    expect("error" in tooLong && tooLong.status).toBe(400);
+
     const past = await bulkCreateEntries(
       {
         user_ids: [adminUserId],