fix: return database user ID from /api/auth/me instead of Logto sub

The /me endpoint was returning auth.sub (Logto's opaque string) as the
user ID, but the frontend and other API endpoints expect numeric DB IDs.
This caused "can't access property 'id', w[0] is undefined" after login.

Also documents Logto OIDC setup requirements (scopes, env vars) in
CLAUDE.md.

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

src/server/routes/auth.ts

@@ -8,6 +8,7 @@ import { requireAuth } from "../middleware/auth.ts";
 import {
 	createApiKey,
 	deleteApiKey,
+	getOrCreateUser,
 	listApiKeys,
 } from "../services/auth.service.ts";
 import { updateProfile } from "../services/profile.service.ts";
@@ -23,8 +24,10 @@ const app = new Hono<Env>();
 app.get("/me", async (c) => {
 	const auth = await getAuth(c);
 	if (auth) {
+		const db = c.get("db");
+		const user = await getOrCreateUser(db, auth.sub);
 		return c.json({
-			user: { id: auth.sub, email: auth.email },
+			user: { id: user.id, email: auth.email },
 			authenticated: true,
 		});
 	}