Initial WatchLink scaffold

tests/access.test.ts

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+import { describe, expect, it } from "vitest";
+import { canEnterRoom } from "../src/lib/access";
+
+describe("canEnterRoom", () => {
+  it("allows public rooms", () => {
+    expect(canEnterRoom({ visibility: "PUBLIC" })).toBe(true);
+  });
+
+  it("allows owners and admins regardless of room visibility", () => {
+    expect(canEnterRoom({ visibility: "EXPLICIT", isOwner: true })).toBe(true);
+    expect(canEnterRoom({ visibility: "ROLE_RESTRICTED", isAdmin: true })).toBe(true);
+  });
+
+  it("requires accepted friend or explicit membership for friends-only rooms", () => {
+    expect(canEnterRoom({ visibility: "FRIENDS" })).toBe(false);
+    expect(canEnterRoom({ visibility: "FRIENDS", isFriend: true })).toBe(true);
+  });
+});

tests/media.test.ts

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+import { describe, expect, it } from "vitest";
+import { normalizeMediaUrl } from "../src/lib/media";
+
+describe("normalizeMediaUrl", () => {
+  it("normalizes YouTube watch urls", () => {
+    const media = normalizeMediaUrl("https://www.youtube.com/watch?v=abc123");
+    expect(media.provider).toBe("YOUTUBE");
+    expect(media.playbackUrl).toContain("/embed/abc123");
+  });
+
+  it("normalizes Twitch channels", () => {
+    const media = normalizeMediaUrl("https://www.twitch.tv/example");
+    expect(media.provider).toBe("TWITCH");
+    expect(media.playbackUrl).toContain("channel=example");
+  });
+
+  it("detects direct video sources", () => {
+    const media = normalizeMediaUrl("https://cdn.example.com/video.mp4");
+    expect(media.provider).toBe("DIRECT");
+    expect(media.playbackUrl).toBe("https://cdn.example.com/video.mp4");
+  });
+});