feat: add POST /api/images/from-url route

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/routes/images.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, test } from "bun:test";
+import { Hono } from "hono";
+import { imageRoutes } from "../../src/server/routes/images";
+
+const app = new Hono();
+app.route("/api/images", imageRoutes);
+
+describe("POST /api/images/from-url", () => {
+	test("returns 400 for missing URL", async () => {
+		const res = await app.request("/api/images/from-url", {
+			method: "POST",
+			headers: { "Content-Type": "application/json" },
+			body: JSON.stringify({}),
+		});
+		expect(res.status).toBe(400);
+	});
+
+	test("returns 400 for invalid URL", async () => {
+		const res = await app.request("/api/images/from-url", {
+			method: "POST",
+			headers: { "Content-Type": "application/json" },
+			body: JSON.stringify({ url: "not-a-url" }),
+		});
+		expect(res.status).toBe(400);
+	});
+});