feat(25-02): add POST single and bulk upsert routes for global items

- POST /api/global-items upserts single item via upsertGlobalItem service
- POST /api/global-items/bulk upserts up to 100 items via bulkUpsertGlobalItems service
- Zod validation via @hono/zod-validator with upsertGlobalItemSchema and bulkUpsertGlobalItemsSchema

src/server/routes/global-items.ts

@@ -1,8 +1,15 @@
+import { zValidator } from "@hono/zod-validator";
 import { Hono } from "hono";
+import {
+	bulkUpsertGlobalItemsSchema,
+	upsertGlobalItemSchema,
+} from "../../shared/schemas.ts";
 import { parseId } from "../lib/params.ts";
 import {
+	bulkUpsertGlobalItems,
 	getGlobalItemWithOwnerCount,
 	searchGlobalItems,
+	upsertGlobalItem,
 } from "../services/global-item.service.ts";
 
 type Env = { Variables: { db?: any } };
@@ -32,4 +39,20 @@ app.get("/:id", async (c) => {
 	return c.json(item);
 });
 
+// Single item upsert — per D-10
+app.post("/", zValidator("json", upsertGlobalItemSchema), async (c) => {
+	const db = c.get("db");
+	const data = c.req.valid("json");
+	const result = await upsertGlobalItem(db, data);
+	return c.json(result);
+});
+
+// Bulk upsert — per D-06, D-07, D-08
+app.post("/bulk", zValidator("json", bulkUpsertGlobalItemsSchema), async (c) => {
+	const db = c.get("db");
+	const { items } = c.req.valid("json");
+	const result = await bulkUpsertGlobalItems(db, items);
+	return c.json(result);
+});
+
 export { app as globalItemRoutes };