docs: add MCP OAuth documentation and fix lint

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

src/server/index.ts

@@ -8,10 +8,10 @@ import { authRoutes } from "./routes/auth.ts";
 import { categoryRoutes } from "./routes/categories.ts";
 import { imageRoutes } from "./routes/images.ts";
 import { itemRoutes } from "./routes/items.ts";
+import { oauthRoutes, wellKnownRoute } from "./routes/oauth.ts";
 import { settingsRoutes } from "./routes/settings.ts";
 import { setupRoutes } from "./routes/setups.ts";
 import { threadRoutes } from "./routes/threads.ts";
-import { oauthRoutes, wellKnownRoute } from "./routes/oauth.ts";
 import { totalRoutes } from "./routes/totals.ts";
 
 // Seed default data on startup