Implement full Couch Potato movie & TV tracking app

Add all 10 milestones: Drizzle ORM + SQLite database with WAL mode,
Better Auth email/password authentication, TMDB API integration for
search and metadata import, TV season/episode caching, user tracking
(watchlist/status/watches/ratings with auto-transitions), discovery
feeds (continue watching, library, recommendations), US streaming
availability via TMDB providers, background job scheduler with
instrumentation hook, and dark cinema-themed frontend with DM Serif
Display + DM Sans typography and amber accent design system.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/auth/client.ts

@@ -0,0 +1,7 @@
+"use client";
+
+import { createAuthClient } from "better-auth/react";
+
+export const authClient = createAuthClient();
+
+export const { signIn, signUp, signOut, useSession } = authClient;

lib/auth/server.ts

@@ -0,0 +1,18 @@
+import { betterAuth } from "better-auth";
+import { drizzleAdapter } from "better-auth/adapters/drizzle";
+import { v4 as uuid } from "uuid";
+import { db } from "@/lib/db/client";
+
+export const auth = betterAuth({
+  database: drizzleAdapter(db, {
+    provider: "sqlite",
+  }),
+  emailAndPassword: {
+    enabled: true,
+  },
+  advanced: {
+    database: {
+      generateId: () => uuid(),
+    },
+  },
+});