feat(18-02): add global item routes, item link/unlink endpoints, and route tests

- GET /api/global-items with optional q search parameter
- GET /api/global-items/:id with ownerCount
- POST /api/items/:id/link to link user item to global item
- DELETE /api/items/:id/link to unlink
- Route registered in index.ts
- 10 route tests covering all endpoints

src/server/index.ts

@@ -8,6 +8,7 @@ import { requireAuth } from "./middleware/auth.ts";
 import { authRoutes } from "./routes/auth.ts";
 import { categoryRoutes } from "./routes/categories.ts";
 import { imageRoutes } from "./routes/images.ts";
+import { globalItemRoutes } from "./routes/global-items.ts";
 import { itemRoutes } from "./routes/items.ts";
 import { oauthRoutes, wellKnownRoute } from "./routes/oauth.ts";
 import { settingsRoutes } from "./routes/settings.ts";
@@ -73,6 +74,7 @@ app.route("/api/images", imageRoutes);
 app.route("/api/settings", settingsRoutes);
 app.route("/api/threads", threadRoutes);
 app.route("/api/setups", setupRoutes);
+app.route("/api/global-items", globalItemRoutes);
 
 // MCP server (conditionally mounted)
 if (process.env.GEARBOX_MCP !== "false") {

src/server/routes/global-items.ts

@@ -0,0 +1,30 @@
+import { Hono } from "hono";
+import { parseId } from "../lib/params.ts";
+import {
+	getGlobalItemWithOwnerCount,
+	searchGlobalItems,
+} from "../services/global-item.service.ts";
+
+type Env = { Variables: { db?: any } };
+
+const app = new Hono<Env>();
+
+app.get("/", (c) => {
+	const db = c.get("db");
+	const q = c.req.query("q");
+	const items = searchGlobalItems(db, q || undefined);
+	return c.json(items);
+});
+
+app.get("/:id", (c) => {
+	const db = c.get("db");
+	const id = parseId(c.req.param("id"));
+	if (!id) return c.json({ error: "Invalid global item ID" }, 400);
+
+	const item = getGlobalItemWithOwnerCount(db, id);
+	if (!item) return c.json({ error: "Global item not found" }, 404);
+
+	return c.json(item);
+});
+
+export { app as globalItemRoutes };

src/server/routes/items.ts

@@ -2,9 +2,17 @@ import { unlink } from "node:fs/promises";
 import { join } from "node:path";
 import { zValidator } from "@hono/zod-validator";
 import { Hono } from "hono";
-import { createItemSchema, updateItemSchema } from "../../shared/schemas.ts";
+import {
+	createItemSchema,
+	linkItemSchema,
+	updateItemSchema,
+} from "../../shared/schemas.ts";
 import { parseId } from "../lib/params.ts";
 import { exportItemsCsv, importItemsCsv } from "../services/csv.service.ts";
+import {
+	linkItemToGlobal,
+	unlinkItemFromGlobal,
+} from "../services/global-item.service.ts";
 import {
 	createItem,
 	deleteItem,
@@ -103,4 +111,32 @@ app.delete("/:id", async (c) => {
 	return c.json({ success: true });
 });
 
+app.post("/:id/link", zValidator("json", linkItemSchema), (c) => {
+	const db = c.get("db");
+	const id = parseId(c.req.param("id"));
+	if (!id) return c.json({ error: "Invalid item ID" }, 400);
+
+	const item = getItemById(db, id);
+	if (!item) return c.json({ error: "Item not found" }, 404);
+
+	try {
+		const link = linkItemToGlobal(db, id, c.req.valid("json").globalItemId);
+		return c.json(link, 201);
+	} catch {
+		return c.json({ error: "Item already linked to a global item" }, 409);
+	}
+});
+
+app.delete("/:id/link", (c) => {
+	const db = c.get("db");
+	const id = parseId(c.req.param("id"));
+	if (!id) return c.json({ error: "Invalid item ID" }, 400);
+
+	const item = getItemById(db, id);
+	if (!item) return c.json({ error: "Item not found" }, 404);
+
+	unlinkItemFromGlobal(db, id);
+	return c.json({ success: true });
+});
+
 export { app as itemRoutes };